The document discusses the key characteristics and components of neurons and the nervous system. It describes the main parts of neurons including the cell body, dendrites, axon, and synapses. It also discusses the roles and features of neuroglia cells like astrocytes, oligodendrocytes, ependymal cells, and microglia that support neuronal function. Additionally, it mentions the different types of neurons based on the number and branching of their dendrites including unipolar, bipolar, and multipolar neurons.
The document contains questions and answers about the nervous system. It defines key terms like the three parts of the nervous system, structures of neurons, classifications of neurons, types of neuroglial cells, and processes like graded potentials, action potentials, and synaptic transmission. It describes the roles of ion channels and neurotransmitters in generating electrical signals in neurons and transmitting them across chemical synapses between neurons.
This document discusses how neurons in the brain release nitric oxide (NO) to control local blood flow. It presents three key findings:
1. Stimulation of individual neurons causes the release of NO, which then dilates nearby blood vessels to increase blood supply. This was shown by directly stimulating neurons with chemicals or electrodes.
2. Chemical or electrical stimulation of specific neurons called stellate neurons led to increased NO levels and blood vessel dilation. Blocking NO production prevented this effect.
3. Models were developed to simulate NO release from neurons in the brain and its effects on blood flow regulation.
Neurons form neural circuits that process sensory information and drive behavior. Glial cells such as astrocytes, oligodendrocytes, microglia, and Schwann cells provide support and insulation to neurons. Neurons communicate with each other at synapses, where neurotransmitters such as glutamate and GABA are released in response to action potentials and bind to receptors on adjacent cells.
1. The visual pathway begins in the retina and passes through the optic nerve, optic chiasm, optic tracts, lateral geniculate bodies, optic radiations, and terminates in the visual cortex.
2. The optic nerve has four parts - intraocular, intraorbital, intracanalicular, and intracranial parts. It carries nerve fibers from the retina and is surrounded by meninges and receives its blood supply from branches of the internal carotid artery.
3. The lateral geniculate bodies contain six layers of neurons that receive input from the retina via the optic tracts and relay this information to the visual cortex via the optic radiations.
This document discusses various materials and therapies for peripheral nerve regeneration. It covers guidance therapies using nerve conduits made from natural and synthetic biomaterials. Biomolecular therapies involve delivering growth factors to promote regeneration. Cellular therapies utilize Schwann cells, stem cells, and genetically modified cells. Advanced techniques include nerve conduits fabricated using 3D printing, injection molding and aligned polymer fibers. Future areas of focus are multi-chamber conduits and stem cell therapies to further enhance regeneration.
The document discusses neurons and synapses in the human brain. It begins by showing an image of a small segment of the human brain, with lines representing neurons and dots representing synapses. It notes that synapses are crucial for neural communication and thought. While the number of brain cells does not increase much after birth, the connections between neurons through synapses continue developing. The document then provides explanations of key concepts regarding neurons, synapses, and neural signaling. It explains how neurons transmit electrical signals, how synapses allow signals to be transmitted between neurons, and how signals propagate along axons through action potentials.
What is different about activities on the two sides of the synapse?Salman Ul Islam
The document discusses the differences between the presynaptic and postsynaptic sides of the synapse. Specifically, it notes that the presynaptic side contains calcium channels and synaptic vesicles filled with neurotransmitters, while the postsynaptic side contains ion channels with receptors for neurotransmitters. It then provides an overview of how neurotransmitters are released from the presynaptic terminal and bind to receptors on the postsynaptic membrane, allowing for transmission of signals between neurons.
The document contains questions and answers about the nervous system. It defines key terms like the three parts of the nervous system, structures of neurons, classifications of neurons, types of neuroglial cells, and processes like graded potentials, action potentials, and synaptic transmission. It describes the roles of ion channels and neurotransmitters in generating electrical signals in neurons and transmitting them across chemical synapses between neurons.
This document discusses how neurons in the brain release nitric oxide (NO) to control local blood flow. It presents three key findings:
1. Stimulation of individual neurons causes the release of NO, which then dilates nearby blood vessels to increase blood supply. This was shown by directly stimulating neurons with chemicals or electrodes.
2. Chemical or electrical stimulation of specific neurons called stellate neurons led to increased NO levels and blood vessel dilation. Blocking NO production prevented this effect.
3. Models were developed to simulate NO release from neurons in the brain and its effects on blood flow regulation.
Neurons form neural circuits that process sensory information and drive behavior. Glial cells such as astrocytes, oligodendrocytes, microglia, and Schwann cells provide support and insulation to neurons. Neurons communicate with each other at synapses, where neurotransmitters such as glutamate and GABA are released in response to action potentials and bind to receptors on adjacent cells.
1. The visual pathway begins in the retina and passes through the optic nerve, optic chiasm, optic tracts, lateral geniculate bodies, optic radiations, and terminates in the visual cortex.
2. The optic nerve has four parts - intraocular, intraorbital, intracanalicular, and intracranial parts. It carries nerve fibers from the retina and is surrounded by meninges and receives its blood supply from branches of the internal carotid artery.
3. The lateral geniculate bodies contain six layers of neurons that receive input from the retina via the optic tracts and relay this information to the visual cortex via the optic radiations.
This document discusses various materials and therapies for peripheral nerve regeneration. It covers guidance therapies using nerve conduits made from natural and synthetic biomaterials. Biomolecular therapies involve delivering growth factors to promote regeneration. Cellular therapies utilize Schwann cells, stem cells, and genetically modified cells. Advanced techniques include nerve conduits fabricated using 3D printing, injection molding and aligned polymer fibers. Future areas of focus are multi-chamber conduits and stem cell therapies to further enhance regeneration.
The document discusses neurons and synapses in the human brain. It begins by showing an image of a small segment of the human brain, with lines representing neurons and dots representing synapses. It notes that synapses are crucial for neural communication and thought. While the number of brain cells does not increase much after birth, the connections between neurons through synapses continue developing. The document then provides explanations of key concepts regarding neurons, synapses, and neural signaling. It explains how neurons transmit electrical signals, how synapses allow signals to be transmitted between neurons, and how signals propagate along axons through action potentials.
What is different about activities on the two sides of the synapse?Salman Ul Islam
The document discusses the differences between the presynaptic and postsynaptic sides of the synapse. Specifically, it notes that the presynaptic side contains calcium channels and synaptic vesicles filled with neurotransmitters, while the postsynaptic side contains ion channels with receptors for neurotransmitters. It then provides an overview of how neurotransmitters are released from the presynaptic terminal and bind to receptors on the postsynaptic membrane, allowing for transmission of signals between neurons.
The human nervous system develops from the neural tube during early embryogenesis. Neurons differentiate and grow axons that connect with other neurons. The central nervous system develops from the neural tube, with the brain and spinal cord forming. The brain is made up of several specialized regions including the cerebral hemispheres, cerebellum, and brainstem. The cerebral cortex has evolved in humans to have extensive folding and the largest surface area, allowing for more complex functions.
This study analyzed dendritic spine morphology in the CA1 region of the hippocampus in a mouse model of Alzheimer's disease (AD). Three key findings were observed:
1) Dendritic spine necks in the stratum oriens layer were significantly shorter in AD mice compared to controls.
2) The frequency of dendritic spines with small head volumes increased in the stratum radiatum layer of AD mice.
3) These layer-specific changes to spine morphology in an AD mouse model may underlie the synaptic dysfunction and cognitive impairments seen in the disease. The changes reflect the effects of amyloid-beta overexpression on excitatory synapses in the hippocampus.
This document discusses the craniovertebral junction (CVJ), which refers collectively to the occiput, atlas, axis, and supporting ligaments. It transitions between the mobile cranium and rigid spinal column, enclosing soft tissues of the cervicomedullary junction. The document covers the embryology and development of the CVJ, anatomy including articulations, ligaments, muscles, neural and vascular structures. It also discusses the kinetics, radiological evaluation including craniometry measurements, and common anomalies seen at the CVJ.
1. Excitable tissues include nerve cells, nerve fibers, muscle fibers, and some plant cells that generate action potentials along their cell membranes in response to stimulation.
2. Nerve cells have a cell body containing organelles, dendrites that receive synaptic inputs, and a single axon that conducts electrical impulses to synaptic terminals.
3. Glial cells such as astrocytes, oligodendrocytes, microglia, and ependymal cells provide support and insulation to neurons in the nervous system.
The document provides an overview of cells and their structures. It discusses the two main types of cells - eukaryotic and prokaryotic cells. It then focuses on eukaryotic cells and the human cells in particular. It notes there are roughly 3 trillion cells in the average adult human. The document is organized into multiple parts that describe the key structures of cells like the nucleus, cellular membrane, ribosomes, endoplasmic reticulum, golgi apparatus, mitochondria, and components specific to nerve cells such as axons, dendrites, myelin sheaths, and synapses.
The origins of the endoneurial collagen of peripheral nerves and their roots have
not yet been determined. Ochoa (1976) has recently commented upon the presence
of collagen in endoneurial clefts some weeks before the earliest appearance of endoneurial
fibroblasts and consequently attributed collagen production to the immediately
adjacent Schwann cells. The occurrence of collagen in 'pockets' invaginated
into the Schwann cells of unmyelinated fibres (Gamble, 1964) was interpreted as
showing a tendency in such cells to enwrap any suitably sized and orientated structure,
but Thomas (1973) thought the phenomenon more probably indicative of a
capacity of Schwann cells to replace degenerated axons with newly formed collagen.
It was remarked also (Ochoa, 1971) that although collagen pockets may be quite
numerous in young adult human nerves they had not appeared in the sural nerve of
a human fetus of 18 weeks of intrauterine life, i.e. at a stage of development when Schwann cells are extremely active in the establishment of complex interrelationships with unmyelinated axons. In the course of work directed to the study of the development of the human trochlear nerve some observations have been made which are pertinent to the problem of the origin of the endoneurial collagen. They are reported and discussed below.
This document summarizes key findings about the molecular mechanisms that regulate myelination in the peripheral nervous system (PNS). It discusses how transcription factors such as Sox10, Oct6, Krox20, and Yy1 control myelination by activating myelin genes and suppressing inhibitors of myelination. It also describes the roles of epigenetic regulators like HDAC1/2, microRNAs, and the influence of cholesterol and fatty acid biosynthesis on myelin synthesis. Additionally, the roles of various cell adhesion molecules and signaling pathways in selecting axons for myelination and forming axo-glial junctions are summarized.
Glial cells - Neurobiology and Clinical AspectsRahul Kumar
Glial cells outnumber neurons in the central nervous system and provide support and protection for neurons. There are several types of glial cells - astrocytes, oligodendrocytes, microglia, and ependymal cells. In disease states, glial cells can become reactive or activated and contribute to conditions like stroke, cerebral edema, Alzheimer's disease, neuropathic pain, epilepsy, and glioma. The document provides an overview of glial cell types, functions, pathophysiology, and their involvement in specific nervous system diseases and conditions.
Chapter 10 Nervous System I - Basic Structure and Functionsgossett5757
The document provides an overview of the basic structure and function of the nervous system. It discusses the main cell types in the nervous system including neurons and neuroglial cells. It describes the divisions of the nervous system into the central nervous system and peripheral nervous system. It also summarizes the key functions of the nervous system including receiving stimuli, processing information, and responding to stimuli.
1. The document discusses the anatomy of the lateral optico-carotid recess (L-OCR) and medial optico-carotid recess (M-OCR).
2. The L-OCR is located within the optic strut, which forms the posterior root of attachment of the anterior clinoid process. The M-OCR is located at the junction between the paraclinoid and supraclinoid internal carotid artery.
3. Understanding the anatomy of the L-OCR and M-OCR is important for skull base and pituitary surgery to avoid injuries to the carotid artery and optic structures.
AI&BigData Lab 2016. Дмитрий Новицкий: cпайковые и бионические нейронные сети...GeeksLab Odessa
1. The document discusses neurons and neural networks from both biological and computational perspectives. It provides historical context on the discovery of neurons in the 17th century and defines key biological concepts like the neuron doctrine, dendrites, axons, and synapses.
2. Functionally, individual neurons are described as input-output devices that integrate excitatory and inhibitory signals at the soma and propagate output signals as spikes along the axon. At the chemical synapse, spike timing influences the strengthening of connections between neurons.
3. Computationally, neural networks are modeled as systems of interconnected neurons that can learn through mechanisms like spike-timing dependent plasticity (STDP) and reinforcement of synaptic transmission based on relative spike timings
The document summarizes retinal anatomy and modeling. It discusses the layers of the retina including photoreceptors, bipolar cells, horizontal cells, amacrine cells, and ganglion cells. It describes the connections between these cells, including chemical synapses and electrical gap junctions. The goal of the author's PhD is to improve an existing retinal model to produce synchronized spike outputs from ganglion cells by adding connections between ganglion cells and between ganglion and amacrine cells.
This document discusses the nervous system, specifically neuroglia and synapses. It defines neuroglia as supporting cells that provide metabolic and immune support to neurons. There are two main types of neuroglia - central neuroglia found in the central nervous system, and peripheral neuroglia found in the peripheral nervous system. Synapses are the junctions between neurons that transmit nerve impulses chemically or electrically. Synapses can be classified anatomically by their location on neurons or functionally based on their mode of impulse transmission. They allow for one-way conduction of signals between neurons and properties like synaptic delay, fatigue, and summation.
The neuromuscular junction is the chemical synapse between a motor neuron and muscle fiber. When an action potential reaches the motor neuron terminal, calcium ions enter and cause vesicles to release acetylcholine into the synaptic cleft. Acetylcholine then binds to nicotinic receptors on the muscle fiber, opening sodium channels and causing an endplate potential that generates an action potential in the muscle fiber, leading to muscle contraction. Acetylcholinesterase breaks down acetylcholine to terminate the signal and allow muscle relaxation.
Neurons transmit information through the nervous system. There are three main types of neurons: sensory, interneurons, and motor neurons. The central nervous system includes the brain and spinal cord, while the peripheral nervous system branches off from the CNS. A neuron contains a nucleus, dendrites, axon, and synapses. Information passes between neurons through chemical messengers called neurotransmitters released at synapses.
Introduction to Modern Methods and Tools for Biologically Plausible Modelling...SSA KPI
This document provides an overview of modern methods and tools for biologically plausible modeling of neural structures in the brain. It discusses modeling at different levels, from the system level looking at the brain as a whole, down to the subcellular and molecular levels examining individual neurons and ion channels. At each level, it outlines key research methods used to study the brain experimentally and different modeling approaches, including population and dynamical models, formal neural networks, and detailed single-cell models. The document also reviews seminal work in neuroscience like Hodgkin and Huxley's equations for modeling ion channel dynamics and spike generation in neurons.
The Brain as a Whole: Executive Neurons and Sustaining Homeostatic GliaInsideScientific
Carl Petersen and Alexei Verkhratsky share their research on homeostatic neuroglia and imaging of neuronal network function. This webinar is brought to you by APS’ new journal, Function, and part of their Physiology in Focus learning series.
During this exclusive live webinar, Carl Petersen and Alexei Verkhratsky discuss astrocyte-mediated homeostatic control of the central nervous system, and how optical and 2-photon microscopy can be used for functional neuroimaging.
Imaging Neuronal Function
Carl Petersen, PhD
Highly dynamic and spatially distributed neuronal circuits in the brain control mammalian behavior. Through technological advances, optical measurements of neuronal function can now be carried out in behaving mice at multiple scales. Wide-field imaging allows the dynamic interactions between different brain areas to be studied as sensory information is processed and transformed into behavioral output. Within a brain region, two-photon microscopy can be used to image the neuronal network activity with cellular resolution allowing different types of projection neurons to be distinguished. Together optical methods provide versatile tools for causal mechanistic understanding of neuronal network function in mice.
Astrocytes: indispensable neuronal supporters in sickness and in health
Alexei Verkhratsky, MD, PhD, DSc
The nervous system is composed of two arms: the executive neurons and the homeostatic neuroglia. The neurons require energy, support, and protection, all of which is provided by the neuroglia. Astrocytes, the principal homeostatic cells of the brain and spinal cord, are tightly integrated into the neural networks and act within the context of the neural tissue. As astrocytes control the homeostasis of the central nervous system at all levels of organization, from the molecular to the whole organ level, we can begin to define and understand brain vulnerabilities to aging and diseases.
El documento describe la anatomía de la columna vertebral. Se divide en cinco secciones principales: vértebras típicas y atípicas, vértebras lumbares típicas y atípica, sacro, cóccix y discos intervertebrales. Detalla las características anatómicas de cada región vertebral, incluyendo cuerpos, procesos, agujeros y articulaciones. También resume los ligamentos de la columna vertebral.
The human nervous system develops from the neural tube during early embryogenesis. Neurons differentiate and grow axons that connect with other neurons. The central nervous system develops from the neural tube, with the brain and spinal cord forming. The brain is made up of several specialized regions including the cerebral hemispheres, cerebellum, and brainstem. The cerebral cortex has evolved in humans to have extensive folding and the largest surface area, allowing for more complex functions.
This study analyzed dendritic spine morphology in the CA1 region of the hippocampus in a mouse model of Alzheimer's disease (AD). Three key findings were observed:
1) Dendritic spine necks in the stratum oriens layer were significantly shorter in AD mice compared to controls.
2) The frequency of dendritic spines with small head volumes increased in the stratum radiatum layer of AD mice.
3) These layer-specific changes to spine morphology in an AD mouse model may underlie the synaptic dysfunction and cognitive impairments seen in the disease. The changes reflect the effects of amyloid-beta overexpression on excitatory synapses in the hippocampus.
This document discusses the craniovertebral junction (CVJ), which refers collectively to the occiput, atlas, axis, and supporting ligaments. It transitions between the mobile cranium and rigid spinal column, enclosing soft tissues of the cervicomedullary junction. The document covers the embryology and development of the CVJ, anatomy including articulations, ligaments, muscles, neural and vascular structures. It also discusses the kinetics, radiological evaluation including craniometry measurements, and common anomalies seen at the CVJ.
1. Excitable tissues include nerve cells, nerve fibers, muscle fibers, and some plant cells that generate action potentials along their cell membranes in response to stimulation.
2. Nerve cells have a cell body containing organelles, dendrites that receive synaptic inputs, and a single axon that conducts electrical impulses to synaptic terminals.
3. Glial cells such as astrocytes, oligodendrocytes, microglia, and ependymal cells provide support and insulation to neurons in the nervous system.
The document provides an overview of cells and their structures. It discusses the two main types of cells - eukaryotic and prokaryotic cells. It then focuses on eukaryotic cells and the human cells in particular. It notes there are roughly 3 trillion cells in the average adult human. The document is organized into multiple parts that describe the key structures of cells like the nucleus, cellular membrane, ribosomes, endoplasmic reticulum, golgi apparatus, mitochondria, and components specific to nerve cells such as axons, dendrites, myelin sheaths, and synapses.
The origins of the endoneurial collagen of peripheral nerves and their roots have
not yet been determined. Ochoa (1976) has recently commented upon the presence
of collagen in endoneurial clefts some weeks before the earliest appearance of endoneurial
fibroblasts and consequently attributed collagen production to the immediately
adjacent Schwann cells. The occurrence of collagen in 'pockets' invaginated
into the Schwann cells of unmyelinated fibres (Gamble, 1964) was interpreted as
showing a tendency in such cells to enwrap any suitably sized and orientated structure,
but Thomas (1973) thought the phenomenon more probably indicative of a
capacity of Schwann cells to replace degenerated axons with newly formed collagen.
It was remarked also (Ochoa, 1971) that although collagen pockets may be quite
numerous in young adult human nerves they had not appeared in the sural nerve of
a human fetus of 18 weeks of intrauterine life, i.e. at a stage of development when Schwann cells are extremely active in the establishment of complex interrelationships with unmyelinated axons. In the course of work directed to the study of the development of the human trochlear nerve some observations have been made which are pertinent to the problem of the origin of the endoneurial collagen. They are reported and discussed below.
This document summarizes key findings about the molecular mechanisms that regulate myelination in the peripheral nervous system (PNS). It discusses how transcription factors such as Sox10, Oct6, Krox20, and Yy1 control myelination by activating myelin genes and suppressing inhibitors of myelination. It also describes the roles of epigenetic regulators like HDAC1/2, microRNAs, and the influence of cholesterol and fatty acid biosynthesis on myelin synthesis. Additionally, the roles of various cell adhesion molecules and signaling pathways in selecting axons for myelination and forming axo-glial junctions are summarized.
Glial cells - Neurobiology and Clinical AspectsRahul Kumar
Glial cells outnumber neurons in the central nervous system and provide support and protection for neurons. There are several types of glial cells - astrocytes, oligodendrocytes, microglia, and ependymal cells. In disease states, glial cells can become reactive or activated and contribute to conditions like stroke, cerebral edema, Alzheimer's disease, neuropathic pain, epilepsy, and glioma. The document provides an overview of glial cell types, functions, pathophysiology, and their involvement in specific nervous system diseases and conditions.
Chapter 10 Nervous System I - Basic Structure and Functionsgossett5757
The document provides an overview of the basic structure and function of the nervous system. It discusses the main cell types in the nervous system including neurons and neuroglial cells. It describes the divisions of the nervous system into the central nervous system and peripheral nervous system. It also summarizes the key functions of the nervous system including receiving stimuli, processing information, and responding to stimuli.
1. The document discusses the anatomy of the lateral optico-carotid recess (L-OCR) and medial optico-carotid recess (M-OCR).
2. The L-OCR is located within the optic strut, which forms the posterior root of attachment of the anterior clinoid process. The M-OCR is located at the junction between the paraclinoid and supraclinoid internal carotid artery.
3. Understanding the anatomy of the L-OCR and M-OCR is important for skull base and pituitary surgery to avoid injuries to the carotid artery and optic structures.
AI&BigData Lab 2016. Дмитрий Новицкий: cпайковые и бионические нейронные сети...GeeksLab Odessa
1. The document discusses neurons and neural networks from both biological and computational perspectives. It provides historical context on the discovery of neurons in the 17th century and defines key biological concepts like the neuron doctrine, dendrites, axons, and synapses.
2. Functionally, individual neurons are described as input-output devices that integrate excitatory and inhibitory signals at the soma and propagate output signals as spikes along the axon. At the chemical synapse, spike timing influences the strengthening of connections between neurons.
3. Computationally, neural networks are modeled as systems of interconnected neurons that can learn through mechanisms like spike-timing dependent plasticity (STDP) and reinforcement of synaptic transmission based on relative spike timings
The document summarizes retinal anatomy and modeling. It discusses the layers of the retina including photoreceptors, bipolar cells, horizontal cells, amacrine cells, and ganglion cells. It describes the connections between these cells, including chemical synapses and electrical gap junctions. The goal of the author's PhD is to improve an existing retinal model to produce synchronized spike outputs from ganglion cells by adding connections between ganglion cells and between ganglion and amacrine cells.
This document discusses the nervous system, specifically neuroglia and synapses. It defines neuroglia as supporting cells that provide metabolic and immune support to neurons. There are two main types of neuroglia - central neuroglia found in the central nervous system, and peripheral neuroglia found in the peripheral nervous system. Synapses are the junctions between neurons that transmit nerve impulses chemically or electrically. Synapses can be classified anatomically by their location on neurons or functionally based on their mode of impulse transmission. They allow for one-way conduction of signals between neurons and properties like synaptic delay, fatigue, and summation.
The neuromuscular junction is the chemical synapse between a motor neuron and muscle fiber. When an action potential reaches the motor neuron terminal, calcium ions enter and cause vesicles to release acetylcholine into the synaptic cleft. Acetylcholine then binds to nicotinic receptors on the muscle fiber, opening sodium channels and causing an endplate potential that generates an action potential in the muscle fiber, leading to muscle contraction. Acetylcholinesterase breaks down acetylcholine to terminate the signal and allow muscle relaxation.
Neurons transmit information through the nervous system. There are three main types of neurons: sensory, interneurons, and motor neurons. The central nervous system includes the brain and spinal cord, while the peripheral nervous system branches off from the CNS. A neuron contains a nucleus, dendrites, axon, and synapses. Information passes between neurons through chemical messengers called neurotransmitters released at synapses.
Introduction to Modern Methods and Tools for Biologically Plausible Modelling...SSA KPI
This document provides an overview of modern methods and tools for biologically plausible modeling of neural structures in the brain. It discusses modeling at different levels, from the system level looking at the brain as a whole, down to the subcellular and molecular levels examining individual neurons and ion channels. At each level, it outlines key research methods used to study the brain experimentally and different modeling approaches, including population and dynamical models, formal neural networks, and detailed single-cell models. The document also reviews seminal work in neuroscience like Hodgkin and Huxley's equations for modeling ion channel dynamics and spike generation in neurons.
The Brain as a Whole: Executive Neurons and Sustaining Homeostatic GliaInsideScientific
Carl Petersen and Alexei Verkhratsky share their research on homeostatic neuroglia and imaging of neuronal network function. This webinar is brought to you by APS’ new journal, Function, and part of their Physiology in Focus learning series.
During this exclusive live webinar, Carl Petersen and Alexei Verkhratsky discuss astrocyte-mediated homeostatic control of the central nervous system, and how optical and 2-photon microscopy can be used for functional neuroimaging.
Imaging Neuronal Function
Carl Petersen, PhD
Highly dynamic and spatially distributed neuronal circuits in the brain control mammalian behavior. Through technological advances, optical measurements of neuronal function can now be carried out in behaving mice at multiple scales. Wide-field imaging allows the dynamic interactions between different brain areas to be studied as sensory information is processed and transformed into behavioral output. Within a brain region, two-photon microscopy can be used to image the neuronal network activity with cellular resolution allowing different types of projection neurons to be distinguished. Together optical methods provide versatile tools for causal mechanistic understanding of neuronal network function in mice.
Astrocytes: indispensable neuronal supporters in sickness and in health
Alexei Verkhratsky, MD, PhD, DSc
The nervous system is composed of two arms: the executive neurons and the homeostatic neuroglia. The neurons require energy, support, and protection, all of which is provided by the neuroglia. Astrocytes, the principal homeostatic cells of the brain and spinal cord, are tightly integrated into the neural networks and act within the context of the neural tissue. As astrocytes control the homeostasis of the central nervous system at all levels of organization, from the molecular to the whole organ level, we can begin to define and understand brain vulnerabilities to aging and diseases.
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El documento describe la anatomía de la columna vertebral. Se divide en cinco secciones principales: vértebras típicas y atípicas, vértebras lumbares típicas y atípica, sacro, cóccix y discos intervertebrales. Detalla las características anatómicas de cada región vertebral, incluyendo cuerpos, procesos, agujeros y articulaciones. También resume los ligamentos de la columna vertebral.
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low birth weight presentation. Low birth weight (LBW) infant is defined as the one whose birth weight is less than 2500g irrespective of their gestational age. Premature birth and low birth weight(LBW) is still a serious problem in newborn. Causing high morbidity and mortality rate worldwide. The nursing care provide to low birth weight babies is crucial in promoting their overall health and development. Through careful assessment, diagnosis,, planning, and evaluation plays a vital role in ensuring these vulnerable infants receive the specialize care they need. In India every third of the infant weight less than 2500g.
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Respiratory issues like asthma are the most sensitive issue that is affecting millions worldwide. It hampers the daily activities leaving the body tired and breathless.
The key to a good grip on asthma is proper knowledge and management strategies. Understanding the patient-specific symptoms and carving out an effective treatment likewise is the best way to keep asthma under control.
The skin is the largest organ and its health plays a vital role among the other sense organs. The skin concerns like acne breakout, psoriasis, or anything similar along the lines, finding a qualified and experienced dermatologist becomes paramount.
5-hydroxytryptamine or 5-HT or Serotonin is a neurotransmitter that serves a range of roles in the human body. It is sometimes referred to as the happy chemical since it promotes overall well-being and happiness.
It is mostly found in the brain, intestines, and blood platelets.
5-HT is utilised to transport messages between nerve cells, is known to be involved in smooth muscle contraction, and adds to overall well-being and pleasure, among other benefits. 5-HT regulates the body's sleep-wake cycles and internal clock by acting as a precursor to melatonin.
It is hypothesised to regulate hunger, emotions, motor, cognitive, and autonomic processes.
Pharmacology of 5-hydroxytryptamine and Antagonist
Neurohistología expo abril 2022.pptx
1. SINAPSIS
Células y sus características únicas
Sinapsis de las neuronas Pericarion
Axón (cilindroeje, banda de Remak)
Dendritas
Neuroglia
Ganglios
Ganglios craneoespinales
Ganglios autónomos
Fibras nerviosas
Fibras nerviosas mielinizadas Fibras
nerviosas amielínicas Conducción de
impulsos nerviosos Transporte axónico
Órganos receptores de neuronas
sensoriales
Terminaciones nerviosas libres (sin
cápsula)
Terminaciones nerviosas
encapsuladas
Reacción de las neuronas a una lesión
Cuerpo celular y dendritas Axón
Factores de crecimiento neural
Correlación clínica
C E L U L A S N E R V I O S A S
DRACORDOVA
RESIDENTE DE
NEUROCIRUGIA
ISSTE
C O R T E Z A C E R E B R A L N E U R O G L I A S
T I N C I O N E S
Nuevo
puesto
Oportunidad
es de
crecimiento
Nuevas
responsabili
dades
HEMTOXILIN
A EOSINA
AZUL
DE
BERLIN
Neurohistología
2. Cuerpo celular, o
pericarion (la parte
que contiene el
núcleo) y todos sus
procesos (axón y
dendritas)
NEUROPILO / realizar sinapsis
Neuroanatomia Funcional texto y atlas, Adel K. Afifi tercera edicion 2020
Neurociencia de Dales, Purves,3ra
edicion 2010
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3. Célula de Purkinje [neurona] del cerebelo
Neuroanatomia Funcional texto y atlas, Adel K. Afifi tercera edicion
2020
Neuroanatomia Funcional texto y atlas, Adel K. Afifi tercera edicion 2020
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4. Las células nerviosas pueden tener forma piramidal,
de redonda, estrellada o granular
Neuroanatomia Funcional texto y atlas, Adel K. Afifi tercera edicion
2020
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5. Variables en cuanto a su número y patrón de ramificación
• Unipolares o seudounipolares ( células ganglionares
sensoriales, de la raíz dorsal )
Neuroanatomia Funcional texto y atlas, Adel K. Afifi tercera edicion 2020
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6. 2.Bipolares ( ganglios periféricos Coclear y Vestibular
y células receptoras olfatorias y retinianas) forma de
huso, en cada extremo de la célula .
Neuroanatomia Funcional texto y atlas, Adel K. Afifi tercera edicion
2020
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7. Pericarion
cuerpo de la célula, contiene el núcleo y varios organelos
Neuroanatomia Funcional texto y atlas, Adel K. Afifi tercera edicion
2020
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8. 3. multipolares ( ganglios autónomos, células del SNC.; un axón y
muchos procesos dendríticos .
Neuroanatomia Funcional texto y atlas, Adel K. Afifi tercera edicion
2020
9. Las dendritas,
área receptora primaria de la célula,
variables en cuanto a su número y ramificación; incrementan el área de
superficie de una neurona.
Neuroanatomia Funcional texto y atlas, Adel K. Afifi tercera edicion
2020
10. Pericarion
(
CUERPO DE LA CÉLULA; NÚCLEO Y ORGANELOS
Neuroanatomia Funcional texto y atlas, Adel K. Afifi tercera edicion 2020
11. Organelo más notable= cuerpos de Nissl en neuronas motoras
somáticas, en el cuerno anterior de la médula espinal o en
núcleos de nervios craneales motores,
se componen de ribonucleoproteínas unidas a la membrana =
retículo endoplásmico.
Neuroanatomia Funcional texto y atlas, Adel K. Afifi tercera edicion 2020
https://www.researchgate.net/figure/Gliobl
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12. Cuerpos de Nissl / RER
Neuroanatomia Funcional texto y atlas, Adel K. Afifi tercera edicion 2020
13. Numerosas mitocondrias diseminadas en la totalidad del citoplasma:
metabóliSMO NEURONAL
Neuroanatomia Funcional texto y atlas, Adel K. Afifi tercera edicion 2020
https://www.researchgate.net/figure/Gliobl
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14. El aparato de
Golgi: vesículas
aplanadas y
granulares recibe
productos de la
síntesis de la
sustancia de Nissl
para síntesis de
glucoproteínas .
Neuroanatomia Funcional texto y atlas, Adel K. Afifi tercera edicion 2020
https://www.researchgate.net/figure/Gliobl
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15. Neurofibrillas: neurofilamentos
Neurotúbulos: transporte rápido de
las moléculas de proteínas,
Neurofilamentos de actina: red bajo la
membrana plasmática,
tres proteínas, subunidades de la
proteína tubulina. S
Pericariones ;
Neuroanatomia Funcional texto y atlas, Adel K. Afifi tercera edicion 2020
16. Axón (cilindroeje, banda de
Remak)
PUNTO DE PARTIDA AXONICO 120 CM O <
Del cuerpo celular surge un axón aislado.
Origen cono axónico, parte del cuerpo celular, carece de sustancia de
Nissl
Inicia el impulso nervioso o potencial de acción.
después del segmento inicial, muchos axones se mielinizan,
Neuroanatomia Funcional texto y atlas, Adel K. Afifi tercera edicion 2020
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17. El axoplasma:
posee muchos organelos:
mitocondrias, microtúbulos, microfilamentos, neurofilamentos,
neurotúbulos, retículo endoplásmico liso, lisosomas y vesículas
Neuroanatomia Funcional texto y atlas, Adel K. Afifi tercera edicion 2020
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18. microtubulos
Más numerosos en los axones sin mielina.
FUNCION: Transporte de sustancias desde el cuerpo
celular hacia los extremos dístales
vVría en relación directa con la masa axónica y el
tipo de nervio;
Neuroanatomia Funcional texto y atlas, Adel K. Afifi tercera edicion 2020
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19. Telodendrones:
extremo distal de un axon.
Neuroanatomia Funcional texto y atlas, Adel K. Afifi tercera edicion 2020
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20. celulas de Schwan
mielinizan los axones del sistema
nervioso periferico.
Oligodendrocitos en el sistema
nervioso central.
Neuroanatomia Funcional texto y atlas, Adel K. Afifi tercera edicion 2020
https://www.researchgate.net/figure/Gliobl
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21. Sitio de canales de sodio controlados por
voltaje
Base fisiologica de la conduccion saltatoria
comunicacio mas veloz entre neuronas.
Nodo de Ranvier
Neuroanatomia Funcional texto y atlas, Adel K. Afifi tercera edicion 2020
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22. Endoneurio:
.
Fibras de tejido conectivo que rodea a los nervios perifericos.
Neuroanatomia Funcional texto y atlas, Adel K. Afifi tercera edicion 2020
https://www.researchgate.net/figure/Gliobl
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23. Recubre la totalidad del nervio:
Epineurio
Neuroanatomia Funcional texto y atlas, Adel K. Afifi tercera edicion 2020
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24. Dendritas
Numerosas proyecciones espinosas; sitios de contacto sináptico con
terminales del axón de otras neuronas.
Neuroanatomia Funcional texto y atlas, Adel K. Afifi tercera edicion 2020
https://www.researchgate.net/figure/Gliobl
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25. Neuroglia
:
Células de apoyo:
1)
Astrocito: Grandes, estrelladas, ramificadas
a. Fibrosos
b. Protoplasmáticos
c. memoria y aprendizaje
Neuroanatomia Funcional texto y atlas, Adel K. Afifi tercera edicion 2020
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26. La proteína ácida fibrilar glial (GFAP) marcador histoquímico
Histología, Astrocitos
Dereck C. Wei ; Elizabeth H. Morrison enero 2022 .
Neuroanatomia Funcional texto y atlas, Adel K. Afifi tercera edicion 2020
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27. ASTROCITOS FIBROSOS; membrana
perivascular limitante
Neuroanatomia Funcional texto y atlas, Adel K. Afifi tercera edicion 2020
Principles of neural sciencie fourth edition Erik R.
Kandel.
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28. ASTROCITOS PROTOPLASMATICOS :
Itermediarios de metabolitos ????
Neuroanatomia Funcional texto y atlas, Adel K. Afifi tercera edicion 2020
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29. 2. Oligodendrocitos:
En hileras
Mielinización en el sistema nervioso central
Amortiguan K
Neuroanatomia Funcional texto y atlas, Adel K. Afifi tercera edicion 2020
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30. CELULAS EPENDIMARIAS:
Revisten conducto central de medula espinal, Ventriculos:
Formacion de liquido cerebroespinal.
Neuroanatomia Funcional texto y atlas, Adel K. Afifi tercera edicion 2020
https://www.researchgate.net/figure/Gliobl
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31. 4. Microglia: fagociticas
Neuroanatomia Funcional texto y atlas, Adel K. Afifi tercera edicion 2020
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32. Capas de la Corteza Cerebral:
1)GRANULOSA / MOLECULAR
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34. 3)
GRANULARES
/
estrellada,
en cesta
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35. Douglas, R and K martin neocortex, in the synaptic Organization of the Brain.
4th edition UK Oxford Uk University Press p 459-509 2018
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36. CAPAS DE LA CORTEZA
CEREBRAL :
• 1) MOLECULAR/
PLEXIFORME: Pocas inter/
neuronas, numerosas dendritas y
axones de capas profundas
• 2) PIRAMIDAL EXTERNA:
Granulares, dendritas apicales,
somas de capa V y VI.
Piramidales , interneuronas
GABAERGICAS .
Neurociencia de Dales, Purves,3ra
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45. Tinción
inmunohistoquímica (IHC)
Primary Melanocytic Neoplasms of the
Central Nervous System and Melanotic
Schwannoma
HMB-45 and Melan-A
( melanoma,
schwanomas)
S100 pronóstico de
daño cerebral
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48. Gracias por su atencion!
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