There are three main categories of neurons: sensory neurons, which conduct impulses to the spinal cord; interneurons, which interconnect sensory and motor neurons; and motor neurons, which conduct impulses from the spinal cord to effectors like muscles. Neurons are similar to other cells but have specialized extensions called dendrites and axons that allow them to communicate electrochemically. The three main parts of a neuron are the cell body, dendrites that receive signals, and a single axon that transmits signals. Glial cells support neurons and include oligodendrocytes, astrocytes, Schwann cells, and microglia. An action potential is the electrochemical signal transmitted along the axon.
Structure of Neuron
Neuron contents ,neuron parts and processes
Classification of neurons according to function, according to
processes, according to shape
Histology of neuron
Structure of Neuron
Neuron contents ,neuron parts and processes
Classification of neurons according to function, according to
processes, according to shape
Histology of neuron
a quick visual understanding of what actually nervous tissue is made up of at cellular level its functions nerve cell types chemical synapse detailed structure of neuron
a quick visual understanding of what actually nervous tissue is made up of at cellular level its functions nerve cell types chemical synapse detailed structure of neuron
Nervous System is a uniquely designed organ system of our body. This presentation is highlighting over the cellular configuration of this system. Neurons & Neuroglia are the two main players of the system. Neuron is the structural & functional unit of the system, while, Neuroglia are the supporting elements. At the end of this presentation, the young learner would be able to recognize different cell types of the Nervous system & their exclusive function.
This informative slide will helpful for the pharmacy as well as all biology students. And this slide contain CNS,PNS, Impulse generation and conduction.
NERVE CELLS FINAL( NEURON AND GLIAL CELLS.pptx FOR NURSING STUDENTSWINCY THIRUMURUGAN
THE NERVOUS SYSTEM CONTAINS TWO MAIN TYPES OF CELLS.
A neuron is a nerve cell that is the basic building block of the
nervous system.
Neurons are the structural and functional unit of the nervous
system.
Neurons are specialized to transmit information throughout the
body.
They constitute the communication network of the nervous system and transfer electrical impulses between the central nervous system and sensory organs such as eye,ear.nose,tongue and skin.
There are Approximately 86-100 billion neurons in the brain.
DENDRITES
Dendrites are the tree-like branched structures that arise from the nerve cell body.
Apart from the main dendrite branches, dendrites may contain additional protrusions
known as dendrite spines.
The axon hillock is a specialized region from which the
axon extends.
The axon is a single elongated tubal structure that extends from the Axon Hillock.
Each neuron has a single axon that extends and branches at its end.
The inner most Plasma membrane around the axon is Axolemma.
Neurilemma is the plasma membrane of schwann cells .
The spaces/gaps between the Schwann cells are known as the nodes of Ranvier and they serve to propagate electrical signals along the axon.
The branched end of the axon is known as the axon terminal[arborization] and
branches at the middle of the axon is axon collaterals .
This is the distal part of the axon that comes in contact with other cells. Also called as terminal boutons.
This part of the axon is largely involved in the release of the neurotransmitter.The cell body, also called the soma, is the spherical part of the neuron that contains the nucleus ,cytoplasm and organelles.
The cell body connects to the dendrites, and send information to the
axon depending on the strength of the signal.
The neuronal cytoplasm have the following
The Nucleus,
Nucleolus,
Endoplasmic Reticulum,
Golgi Apparatus,
Mitochondria,
Ribosomes,
Lysosomes,
Endosomes,
And Peroxisomes. A bipolar neuron is a type of neuron which has two extensions (one axon and one dendrite).
A multipolar neuron is a type of neuron that possesses a single axon and many dendrites (and dendritic branches), allowing for the integration of a great deal of information from other neurons.
TYPES OF NEURON:
A unipolar neuron is a type of neuron in which only one process called a neurite extends from the cell body. A pseudounipolar neuron is a type of neuron which has one extension from its cell body. This type of neuron contains an axon that has split into two branches; one branch travels to the PNS and the other to the CNS.They are three types of neurons based on the function as follows Sensory Neuron
Inter-Neuron
Motor Neuron
Interneurons are the central nodes of neural circuits, enabling communication between sensory or motor neurons and the (CNS).
Glial cells (named from the Greek word for "glue") are non- neuronal cells that
provide support and nutrition,
maintain homeostasis,
form myelin,
and participate in signal transmission.
Nervous System -Autonomic Nervous System-Neurons -Ganglia - Nerves Copy.Home
The nervous system is the body's communication network, coordinating and regulating all bodily functions. Comprising the central nervous system (CNS) and peripheral nervous system (PNS), it consists of neurons, specialized cells transmitting electrical and chemical signals. The CNS, consisting of the brain and spinal cord, interprets and processes information. The PNS extends from the CNS, transmitting signals between the brain, spinal cord, and the rest of the body. Sensory neurons detect stimuli, while motor neurons control muscle movement. This intricate system enables sensory perception, voluntary and involuntary actions, and regulates bodily processes, ensuring homeostasis and facilitating responses to the environment.
Nervous System -Autonomic Nervous System-Neurons -Ganglia - Nerves Copy.Home
The nervous system is the body's communication network, coordinating and regulating all bodily functions. Comprising the central nervous system (CNS) and peripheral nervous system (PNS), it consists of neurons, specialized cells transmitting electrical and chemical signals. The CNS, consisting of the brain and spinal cord, interprets and processes information. The PNS extends from the CNS, transmitting signals between the brain, spinal cord, and the rest of the body. Sensory neurons detect stimuli, while motor neurons control muscle movement. This intricate system enables sensory perception, voluntary and involuntary actions, and regulates bodily processes, ensuring homeostasis and facilitating responses to the environment.
2024.06.01 Introducing a competency framework for languag learning materials ...Sandy Millin
http://sandymillin.wordpress.com/iateflwebinar2024
Published classroom materials form the basis of syllabuses, drive teacher professional development, and have a potentially huge influence on learners, teachers and education systems. All teachers also create their own materials, whether a few sentences on a blackboard, a highly-structured fully-realised online course, or anything in between. Despite this, the knowledge and skills needed to create effective language learning materials are rarely part of teacher training, and are mostly learnt by trial and error.
Knowledge and skills frameworks, generally called competency frameworks, for ELT teachers, trainers and managers have existed for a few years now. However, until I created one for my MA dissertation, there wasn’t one drawing together what we need to know and do to be able to effectively produce language learning materials.
This webinar will introduce you to my framework, highlighting the key competencies I identified from my research. It will also show how anybody involved in language teaching (any language, not just English!), teacher training, managing schools or developing language learning materials can benefit from using the framework.
Acetabularia Information For Class 9 .docxvaibhavrinwa19
Acetabularia acetabulum is a single-celled green alga that in its vegetative state is morphologically differentiated into a basal rhizoid and an axially elongated stalk, which bears whorls of branching hairs. The single diploid nucleus resides in the rhizoid.
Model Attribute Check Company Auto PropertyCeline George
In Odoo, the multi-company feature allows you to manage multiple companies within a single Odoo database instance. Each company can have its own configurations while still sharing common resources such as products, customers, and suppliers.
How to Make a Field invisible in Odoo 17Celine George
It is possible to hide or invisible some fields in odoo. Commonly using “invisible” attribute in the field definition to invisible the fields. This slide will show how to make a field invisible in odoo 17.
Welcome to TechSoup New Member Orientation and Q&A (May 2024).pdfTechSoup
In this webinar you will learn how your organization can access TechSoup's wide variety of product discount and donation programs. From hardware to software, we'll give you a tour of the tools available to help your nonprofit with productivity, collaboration, financial management, donor tracking, security, and more.
Embracing GenAI - A Strategic ImperativePeter Windle
Artificial Intelligence (AI) technologies such as Generative AI, Image Generators and Large Language Models have had a dramatic impact on teaching, learning and assessment over the past 18 months. The most immediate threat AI posed was to Academic Integrity with Higher Education Institutes (HEIs) focusing their efforts on combating the use of GenAI in assessment. Guidelines were developed for staff and students, policies put in place too. Innovative educators have forged paths in the use of Generative AI for teaching, learning and assessments leading to pockets of transformation springing up across HEIs, often with little or no top-down guidance, support or direction.
This Gasta posits a strategic approach to integrating AI into HEIs to prepare staff, students and the curriculum for an evolving world and workplace. We will highlight the advantages of working with these technologies beyond the realm of teaching, learning and assessment by considering prompt engineering skills, industry impact, curriculum changes, and the need for staff upskilling. In contrast, not engaging strategically with Generative AI poses risks, including falling behind peers, missed opportunities and failing to ensure our graduates remain employable. The rapid evolution of AI technologies necessitates a proactive and strategic approach if we are to remain relevant.
Biological screening of herbal drugs: Introduction and Need for
Phyto-Pharmacological Screening, New Strategies for evaluating
Natural Products, In vitro evaluation techniques for Antioxidants, Antimicrobial and Anticancer drugs. In vivo evaluation techniques
for Anti-inflammatory, Antiulcer, Anticancer, Wound healing, Antidiabetic, Hepatoprotective, Cardio protective, Diuretics and
Antifertility, Toxicity studies as per OECD guidelines
6. NEURONS VS. OTHER CELLS IN THE BODY
NEURONS ARE SIMILAR TO OTHER CELLS IN THE BODY BECAUSE:
• Neurons are surrounded by a cell membrane.
• Neurons have a nucleus that contains genes.
• Neurons contain cytoplasm, mitochondria and other
organelles.
• Neurons carry out basic cellular processes such as
protein synthesis and energy production.
NEURONS DIFFER FROM OTHER CELLS IN THE BODY BECAUSE:
• Neurons have specialized extensions called dendrites
and axons. Dendrites bring information to the cell body
and axons take information away from the cell body.
• Neurons communicate with each other through an
electrochemical process.
• Neurons contain some specialized structures (for
example, synapses) and chemicals (for example,
neurotransmitters).
10. THREE GENERAL CATEGORIES OF NEURONS
SENSORY NEURON INTERNEURON MOTOR NEURON
Long dendrites and Short dendrites and Short dendrites and
LENGTH OF FIBERS
short axon short or long axon long axon
Cell body and
Dendrites and the
dendrite are
cell body are
outside of the
Entirely within the located in the
LOCATION spinal cord; the cell
spinal cord or CNS spinal cord; the
body is located in
axon is outside of
a dorsal root
the spinal cord
ganglion
Interconnect the
Conduct impulse to
Conduct impulse to sensory neuron with
FUNCTION an effector (muscle
the spinal cord appropriate motor
or gland)
neuron
21. DENDRITES VS. AXON
Take information away Bring information to the
from the cell body cell body
Rough Surface (dendritic
Smooth Surface
spines)
Generally only 1 axon per Usually many dendrites
cell per cell
No ribosomes Have ribosomes
Can have myelin No myelin insulation
Branch further from the Branch near the cell
cell body body
When a neuron is not sending a signal, it is "at rest." When a neuron is at rest, the inside of the neuron is negative relative to the outside. Although the concentrations of the different ions attempt to balance out on both sides of the membrane, they cannot because the cell membrane allows only some ions to pass through channels (ion channels).
The resting membrane potential of a neuron is about -70 mV (mV=millivolt) - this means that the inside of the neuron is 70 mV less than the outside.
The resting potential tells about what happens when a neuron is at rest. An action potential occurs when a neuron sends information down an axon, away from the cell body. Neuroscientists use other words, such as a "spike" or an "impulse" for the action potential.
The resting potential tells about what happens when a neuron is at rest. An action potential occurs when a neuron sends information down an axon, away from the cell body. Neuroscientists use other words, such as a "spike" or an "impulse" for the action potential. If the neuron does not reach this critical threshold level, then no action potential will fire. Also, when the threshold level is reached, an action potential of a fixed sized will always fire...for any given neuron, the size of the action potential is always the same. There are no big or small action potentials in one nerve cell - all action potentials are the same size. Therefore, the neuron either does not reach the threshold or a full action potential is fired - this is the "ALL OR NONE" principle.
Because there are many more sodium ions on the outside, and the inside of the neuron is negative relative to the outside, sodium ions rush into the neuron. Remember, sodium has a positive charge, so the neuron becomes more positive and becomes depolarized.The action potential actually goes past -70 mV (a hyperpolarization) because the potassium channels stay open a bit too long.
The vesicle membrane will fuse with the presynaptic membrane releasing the neurotransmitters into the synaptic cleft. Until recently, it was thought that a neuron produced and released only one type of neurotransmitter. This was called "Dale's Law." However, there is now evidence that neurons can contain and release more than one kind of neurotransmitter.
Diffusion of Neurotransmitters Across the Synaptic CleftThe neurotransmitter molecules then diffuse across the synaptic cleft where they can bind with receptor sites on the postsynaptic ending to influence the electrical response in the postsynaptic neuron. In the figure on the right, the postsynaptic ending is a dendrite (axodendritic synapse), but synapses can occur on axons (axoaxonic synapse) and cell bodies (axosomatic synapse).When a neurotransmitter binds to a receptor on the postsynaptic side of the synapse, it changes the postsynaptic cell's excitability: it makes the postsynaptic cell either more or less likely to fire an action potential. If the number of excitatory postsynaptic events is large enough, they will add to cause an action potential in the postsynaptic cell and a continuation of the "message."
Diffusion of Neurotransmitters Across the Synaptic CleftThe neurotransmitter molecules then diffuse across the synaptic cleft where they can bind with receptor sites on the postsynaptic ending to influence the electrical response in the postsynaptic neuron. In the figure on the right, the postsynaptic ending is a dendrite (axodendritic synapse), but synapses can occur on axons (axoaxonic synapse) and cell bodies (axosomatic synapse).When a neurotransmitter binds to a receptor on the postsynaptic side of the synapse, it changes the postsynaptic cell's excitability: it makes the postsynaptic cell either more or less likely to fire an action potential. If the number of excitatory postsynaptic events is large enough, they will add to cause an action potential in the postsynaptic cell and a continuation of the "message."
Diffusion of Neurotransmitters Across the Synaptic CleftThe neurotransmitter molecules then diffuse across the synaptic cleft where they can bind with receptor sites on the postsynaptic ending to influence the electrical response in the postsynaptic neuron. In the figure on the right, the postsynaptic ending is a dendrite (axodendritic synapse), but synapses can occur on axons (axoaxonic synapse) and cell bodies (axosomatic synapse).When a neurotransmitter binds to a receptor on the postsynaptic side of the synapse, it changes the postsynaptic cell's excitability: it makes the postsynaptic cell either more or less likely to fire an action potential. If the number of excitatory postsynaptic events is large enough, they will add to cause an action potential in the postsynaptic cell and a continuation of the "message."