The document discusses the structure and function of the nervous system. It describes how the nervous system is composed of nervous tissue, including neurons and neuroglial cells. Neurons are the conducting cells that send and receive signals, while neuroglial cells provide support and insulation. The document outlines the key cell types, their roles, and organizational structure of the central and peripheral nervous systems.
Skeletal muscle is one of the three significant muscle tissues in the human body. Each skeletal muscle consists of thousands of muscle fibers wrapped together by connective tissue sheaths. The individual bundles of muscle fibers in a skeletal muscle are known as fasciculi.
Skeletal muscle is one of the three significant muscle tissues in the human body. Each skeletal muscle consists of thousands of muscle fibers wrapped together by connective tissue sheaths. The individual bundles of muscle fibers in a skeletal muscle are known as fasciculi.
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Nerve supply of head & neck by Dr. Amit Suryawanshi .Oral & Maxillofacial ...All Good Things
Description:
Hi. This is Dr. Amit T. Suryawanshi. Oral & Maxillofacial surgeon from Pune, India. I am here on slideshare.com to share some of my own presentations presented at various levels in the field of OMFS. Hope this would somehow be helpful to you making your presentations. All the best & your replies are welcomed!
Nerve supply of head & neck by Dr. Amit T. Suryawanshi, Oral Surgeon, Pune All Good Things
Hi. This is Dr. Amit T. Suryawanshi. Oral & Maxillofacial surgeon from Pune, India. I am here on slideshare.com to share some of my own presentations presented at various levels in the field of OMFS. Hope this would somehow be helpful to you making your presentations. All the best.
the nervous system is a highly complex part of an animal that coordinates its actions and sensory information by transmitting signals to and from different parts of its body.
This informative slide will helpful for the pharmacy as well as all biology students. And this slide contain CNS,PNS, Impulse generation and conduction.
Neural control and coordination are fundamental aspects of the human body's functioning, orchestrating complex processes ranging from basic reflexes to intricate cognitive functions. In Class 11 Biology Neural Control and Coordination, understanding the nervous system's structure, functioning, and coordination mechanisms is crucial for gaining insights into physiological processes and behavioral responses. Let's delve into a detailed study of neural control and coordination:
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Chemical coordination and integration are crucial processes in living organisms, including humans, facilitating communication and regulation among various body systems. In the human body, this coordination primarily occurs through the endocrine system, which comprises glands that secrete hormones. These detailed study notes will delve into the intricacies of chemical coordination and integration, covering its components, mechanisms, and significance.
For more information, visit-www.vavaclasses.com
production and information on Hyaluronic acid.Riddhi Karnik
history and information about hyaluronic acid its Production of hyaluronic acid. the traditional way and by genetically modifying organisms.source used is molecular biotechnology 4th edition by GICK.
Epidemiology of marburg hemorrhagic feverRiddhi Karnik
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antimicrobial potential of parthenium plant extracts and studyRiddhi Karnik
this is a small project done at undergrad level on pathenium plant which is a harmful weed especially in INDIA it destroys the crops to a very large extent
Observation of Io’s Resurfacing via Plume Deposition Using Ground-based Adapt...Sérgio Sacani
Since volcanic activity was first discovered on Io from Voyager images in 1979, changes
on Io’s surface have been monitored from both spacecraft and ground-based telescopes.
Here, we present the highest spatial resolution images of Io ever obtained from a groundbased telescope. These images, acquired by the SHARK-VIS instrument on the Large
Binocular Telescope, show evidence of a major resurfacing event on Io’s trailing hemisphere. When compared to the most recent spacecraft images, the SHARK-VIS images
show that a plume deposit from a powerful eruption at Pillan Patera has covered part
of the long-lived Pele plume deposit. Although this type of resurfacing event may be common on Io, few have been detected due to the rarity of spacecraft visits and the previously low spatial resolution available from Earth-based telescopes. The SHARK-VIS instrument ushers in a new era of high resolution imaging of Io’s surface using adaptive
optics at visible wavelengths.
What is greenhouse gasses and how many gasses are there to affect the Earth.moosaasad1975
What are greenhouse gasses how they affect the earth and its environment what is the future of the environment and earth how the weather and the climate effects.
THE IMPORTANCE OF MARTIAN ATMOSPHERE SAMPLE RETURN.Sérgio Sacani
The return of a sample of near-surface atmosphere from Mars would facilitate answers to several first-order science questions surrounding the formation and evolution of the planet. One of the important aspects of terrestrial planet formation in general is the role that primary atmospheres played in influencing the chemistry and structure of the planets and their antecedents. Studies of the martian atmosphere can be used to investigate the role of a primary atmosphere in its history. Atmosphere samples would also inform our understanding of the near-surface chemistry of the planet, and ultimately the prospects for life. High-precision isotopic analyses of constituent gases are needed to address these questions, requiring that the analyses are made on returned samples rather than in situ.
This presentation explores a brief idea about the structural and functional attributes of nucleotides, the structure and function of genetic materials along with the impact of UV rays and pH upon them.
Comparing Evolved Extractive Text Summary Scores of Bidirectional Encoder Rep...University of Maribor
Slides from:
11th International Conference on Electrical, Electronics and Computer Engineering (IcETRAN), Niš, 3-6 June 2024
Track: Artificial Intelligence
https://www.etran.rs/2024/en/home-english/
Richard's aventures in two entangled wonderlandsRichard Gill
Since the loophole-free Bell experiments of 2020 and the Nobel prizes in physics of 2022, critics of Bell's work have retreated to the fortress of super-determinism. Now, super-determinism is a derogatory word - it just means "determinism". Palmer, Hance and Hossenfelder argue that quantum mechanics and determinism are not incompatible, using a sophisticated mathematical construction based on a subtle thinning of allowed states and measurements in quantum mechanics, such that what is left appears to make Bell's argument fail, without altering the empirical predictions of quantum mechanics. I think however that it is a smoke screen, and the slogan "lost in math" comes to my mind. I will discuss some other recent disproofs of Bell's theorem using the language of causality based on causal graphs. Causal thinking is also central to law and justice. I will mention surprising connections to my work on serial killer nurse cases, in particular the Dutch case of Lucia de Berk and the current UK case of Lucy Letby.
DERIVATION OF MODIFIED BERNOULLI EQUATION WITH VISCOUS EFFECTS AND TERMINAL V...Wasswaderrick3
In this book, we use conservation of energy techniques on a fluid element to derive the Modified Bernoulli equation of flow with viscous or friction effects. We derive the general equation of flow/ velocity and then from this we derive the Pouiselle flow equation, the transition flow equation and the turbulent flow equation. In the situations where there are no viscous effects , the equation reduces to the Bernoulli equation. From experimental results, we are able to include other terms in the Bernoulli equation. We also look at cases where pressure gradients exist. We use the Modified Bernoulli equation to derive equations of flow rate for pipes of different cross sectional areas connected together. We also extend our techniques of energy conservation to a sphere falling in a viscous medium under the effect of gravity. We demonstrate Stokes equation of terminal velocity and turbulent flow equation. We look at a way of calculating the time taken for a body to fall in a viscous medium. We also look at the general equation of terminal velocity.
Earliest Galaxies in the JADES Origins Field: Luminosity Function and Cosmic ...Sérgio Sacani
We characterize the earliest galaxy population in the JADES Origins Field (JOF), the deepest
imaging field observed with JWST. We make use of the ancillary Hubble optical images (5 filters
spanning 0.4−0.9µm) and novel JWST images with 14 filters spanning 0.8−5µm, including 7 mediumband filters, and reaching total exposure times of up to 46 hours per filter. We combine all our data
at > 2.3µm to construct an ultradeep image, reaching as deep as ≈ 31.4 AB mag in the stack and
30.3-31.0 AB mag (5σ, r = 0.1” circular aperture) in individual filters. We measure photometric
redshifts and use robust selection criteria to identify a sample of eight galaxy candidates at redshifts
z = 11.5 − 15. These objects show compact half-light radii of R1/2 ∼ 50 − 200pc, stellar masses of
M⋆ ∼ 107−108M⊙, and star-formation rates of SFR ∼ 0.1−1 M⊙ yr−1
. Our search finds no candidates
at 15 < z < 20, placing upper limits at these redshifts. We develop a forward modeling approach to
infer the properties of the evolving luminosity function without binning in redshift or luminosity that
marginalizes over the photometric redshift uncertainty of our candidate galaxies and incorporates the
impact of non-detections. We find a z = 12 luminosity function in good agreement with prior results,
and that the luminosity function normalization and UV luminosity density decline by a factor of ∼ 2.5
from z = 12 to z = 14. We discuss the possible implications of our results in the context of theoretical
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Salas, V. (2024) "John of St. Thomas (Poinsot) on the Science of Sacred Theol...Studia Poinsotiana
I Introduction
II Subalternation and Theology
III Theology and Dogmatic Declarations
IV The Mixed Principles of Theology
V Virtual Revelation: The Unity of Theology
VI Theology as a Natural Science
VII Theology’s Certitude
VIII Conclusion
Notes
Bibliography
All the contents are fully attributable to the author, Doctor Victor Salas. Should you wish to get this text republished, get in touch with the author or the editorial committee of the Studia Poinsotiana. Insofar as possible, we will be happy to broker your contact.
The ability to recreate computational results with minimal effort and actionable metrics provides a solid foundation for scientific research and software development. When people can replicate an analysis at the touch of a button using open-source software, open data, and methods to assess and compare proposals, it significantly eases verification of results, engagement with a diverse range of contributors, and progress. However, we have yet to fully achieve this; there are still many sociotechnical frictions.
Inspired by David Donoho's vision, this talk aims to revisit the three crucial pillars of frictionless reproducibility (data sharing, code sharing, and competitive challenges) with the perspective of deep software variability.
Our observation is that multiple layers — hardware, operating systems, third-party libraries, software versions, input data, compile-time options, and parameters — are subject to variability that exacerbates frictions but is also essential for achieving robust, generalizable results and fostering innovation. I will first review the literature, providing evidence of how the complex variability interactions across these layers affect qualitative and quantitative software properties, thereby complicating the reproduction and replication of scientific studies in various fields.
I will then present some software engineering and AI techniques that can support the strategic exploration of variability spaces. These include the use of abstractions and models (e.g., feature models), sampling strategies (e.g., uniform, random), cost-effective measurements (e.g., incremental build of software configurations), and dimensionality reduction methods (e.g., transfer learning, feature selection, software debloating).
I will finally argue that deep variability is both the problem and solution of frictionless reproducibility, calling the software science community to develop new methods and tools to manage variability and foster reproducibility in software systems.
Exposé invité Journées Nationales du GDR GPL 2024
2. Common course objectives:
1.1. Functions of the nervous systemFunctions of the nervous system
2.2. Organization of the nervous systemOrganization of the nervous system
3.3. Nerve tissue and nerve cell typesNerve tissue and nerve cell types
4.4. Structure of a typical neuronStructure of a typical neuron
5.5. Structure of a chemical synapseStructure of a chemical synapse
4. The NervousThe Nervous SystemSystem
Defined:Defined: like the CPU of a computer, the nervouslike the CPU of a computer, the nervous
system is thesystem is the master controlling systemmaster controlling system of the body. It isof the body. It is
designed to constantly and rapidly adjust anddesigned to constantly and rapidly adjust and
respond to stimuli the body receives. It includes therespond to stimuli the body receives. It includes the
brain, cranial nerves, spinal cord, and associatedbrain, cranial nerves, spinal cord, and associated
peripheral nerves.peripheral nerves.
Divisions of the nervous sytem:Divisions of the nervous sytem:
CNS = Brain + spinal cordCNS = Brain + spinal cord
PNS = Cranial nerves (12) + Spinal nerves (31 pairs)PNS = Cranial nerves (12) + Spinal nerves (31 pairs)
PNS = ANS, SS and SMSPNS = ANS, SS and SMS
5. Properties of NeuronsProperties of Neurons
1.1. ExcitabilityExcitability (irritability): ability to respond to environmental(irritability): ability to respond to environmental
changes or stimuli.changes or stimuli.
2.2. ConductivityConductivity: respond to stimuli by initiating electrical: respond to stimuli by initiating electrical
signals that travel quickly to other cells at distant locations.signals that travel quickly to other cells at distant locations.
3.3. SecretionSecretion: Upon arrival of the impulse at a distant location: Upon arrival of the impulse at a distant location
the neuron usually secretes a chemical neurotransmitter at athe neuron usually secretes a chemical neurotransmitter at a
synapse that crosses the synaptic gap and stimulates the nextsynapse that crosses the synaptic gap and stimulates the next
cell.cell.
7. Functional Classes of Neurons
Sensory (afferent) neuronsSensory (afferent) neurons – afferent neurons are– afferent neurons are
specialized to detect stimuli and transmit the information tospecialized to detect stimuli and transmit the information to
CNS. They begin in any organ in the body, but end in theCNS. They begin in any organ in the body, but end in the
brain or spinal cord.brain or spinal cord.
Interneurons (association neurons):Interneurons (association neurons): lie entirely in thelie entirely in the
CNS. They receive signals from many different neurons andCNS. They receive signals from many different neurons and
perform an integrative function “decision making” toperform an integrative function “decision making” to
respond to the different stimuli.respond to the different stimuli.
Motor (efferent) neuronsMotor (efferent) neurons –– efferent neurons transmit theefferent neurons transmit the
appropriate response from the interneuron to an end organappropriate response from the interneuron to an end organ
(muscle and gland cells) to carry out the body’s response to(muscle and gland cells) to carry out the body’s response to
the stimuli.the stimuli.
8. Functional Classification of NeuronsFunctional Classification of Neurons
Based on the direction of conductionBased on the direction of conduction
Sensory or afferent conduct toward the CNS ~ 100 millionSensory or afferent conduct toward the CNS ~ 100 million
Motor or efferent conduct away from the CNS ~ 500,000Motor or efferent conduct away from the CNS ~ 500,000
Interneuron interposed between sensory and motor ~ 500Interneuron interposed between sensory and motor ~ 500
billionbillion
9. Organization of the Nervous System
Two main divisions:
The Central Nervous System (CNS)
- Consists of the brain and spinal cord with tracts and
nuclei
Nucleus = a collection of nerve cell bodies in the CNS.
Tract = bundle of nerve fibers within the CNS
The Peripheral Nervous System (PNS)
-Consists of ganglia, cranial nerves, spinal nerves and
peripheral receptors
Ganglia = a collection of nerve cell bodies in the PNS
Nerve = bundle of nerve fibers in the PNS
13. Peripheral Nervous System (PNS)
Composed of cranial nerves and spinal nerves andComposed of cranial nerves and spinal nerves and
their branches, ganglia and sensory receptors.their branches, ganglia and sensory receptors.
PNSPNS is subdivided into sensory and motor divisions:is subdivided into sensory and motor divisions:
somatic nervous system (SNS)somatic nervous system (SNS)
autonomic nervous system (ANS) and theautonomic nervous system (ANS) and the
enteric nervous system (ENS)enteric nervous system (ENS)
14. Sensory or Afferent Division
Somatic sensory == senses touch, pressure, pain,senses touch, pressure, pain,
temperature, vibration and proprioception in skin,temperature, vibration and proprioception in skin,
body wall and limbs.body wall and limbs.
Visceral sensory = Autonomic sensory division-= Autonomic sensory division-
sensessenses stretch, pain, temperature, chemical changesstretch, pain, temperature, chemical changes
and irritation in viscera; nausea and hungerand irritation in viscera; nausea and hunger..
15. Motor or Efferent Division
Somatic motor
--motor control to all skeletal muscles except pharyngealmotor control to all skeletal muscles except pharyngeal
muscles.muscles.
Visceral Motor = Autonomic Nervous System= Autonomic Nervous System
-Sensory receptors convey information from visceral organs-Sensory receptors convey information from visceral organs
(e.g. heart, lungs, intestines, etc.) to the CNS for integration(e.g. heart, lungs, intestines, etc.) to the CNS for integration
and interpretation.and interpretation.
-A motor response is initiated that conducts impulses from-A motor response is initiated that conducts impulses from
CNS to smooth muscle, cardiac muscle and/or glands forCNS to smooth muscle, cardiac muscle and/or glands for
appropriate responseappropriate response
16. Autonomic Nervous System
Two divisions of ANSTwo divisions of ANS
Sympathetic division – Fight or FlightSympathetic division – Fight or Flight
Parasympathetic division – Food or SexParasympathetic division – Food or Sex
18. Structural Classification of Neurons
Neurons may be: Multipolar, Bipolar or Unipolar
Determined by the number of processes attached to
the cell body
19. Neurons
Most (99%) neurons in the body are multipolar.
Bipolar neurons are rare and occur in special sense
organs of ear, nose and eye.
Unipolar neurons begin as bipolar but processes
fuse into one. They are primarily sensory neurons.
ex. dorsal root ganglion
20. Neuroglia cells
Found in CNS and PNS
Perform a supporting function for neurons
CNS PNS
Oligodendrogliocytes Schwann cells
Astrocytes Satellite cells
Ependymal cells
Microglia
23. Myelin
Insulating layer around a nerve
Formed by oligodendrocytes in CNS and Schwann
cells in PNS
Composed of a lipoprotein with phospholipids,
glycolipids and cholesterol.
Myelination is the process of myelin formation
Myelin allows nerve conduction to be 150 x faster
than nonmyelinated nerves. This occcurs by “Saltatory
conduction” and the impulse jumps from Node to
Node.
24. Microglia - CNS
Thorny bushes in appearance and the smallest glia
Phagocytic function in CNS
Originate from monocytes
25. Astrocytes - CNS
Star shapedStar shaped Most numerousMost numerous
Blood brain barrierBlood brain barrier
26. Ependymal cells - CNS
Epithelial cells that line ventricles and central cavities of brainEpithelial cells that line ventricles and central cavities of brain
and spinal cord-secrete CSFand spinal cord-secrete CSF
Ciliated to help circulate CSFCiliated to help circulate CSF
27. Schwann cells- PNS
Form myelin sheath around peripheral axonsForm myelin sheath around peripheral axons
Look like jelly roll with neurolemma coverLook like jelly roll with neurolemma cover
Node of Ranvier separates each Schwann cellNode of Ranvier separates each Schwann cell
30. Nerve conduction velocityNerve conduction velocity
Velocity is dependent on size and myelination.Velocity is dependent on size and myelination.
31. Satellite cells -PNS
Surround neuron cell bodies within gangliaSurround neuron cell bodies within ganglia
Provide nutrients, remove metabolites etc.Provide nutrients, remove metabolites etc.
32. Nerve structureNerve structure
Nerves are only in the peripheryNerves are only in the periphery
Cable-like organs in PNS = cranial and spinal nervesCable-like organs in PNS = cranial and spinal nerves
Consists of 100’s to 100,000’s of myelinated andConsists of 100’s to 100,000’s of myelinated and
unmyelinated axons (nerve fibers).unmyelinated axons (nerve fibers).
EndoneuriumEndoneurium surrounds each axon (nerve fiber).surrounds each axon (nerve fiber).
Axons are grouped into bundles ofAxons are grouped into bundles of fasciclesfascicles
PerineuriumPerineurium surrounds each fasciclesurrounds each fascicle
EpineuriumEpineurium surrounds each nerve bundlesurrounds each nerve bundle
Conduction is saltatory (i.e. jumps node to node) inConduction is saltatory (i.e. jumps node to node) in
myelinated nerves and continuous in nonmyelinated.myelinated nerves and continuous in nonmyelinated.
35. Synapse
The connection between 2 or more nerves andThe connection between 2 or more nerves and
they are separated by a space or cleft.they are separated by a space or cleft.
36. Synaptic terminology
SynapseSynapse – site where two nerves communicate with– site where two nerves communicate with
each other.each other.
Presynaptic neuronPresynaptic neuron – neuron that is conducting– neuron that is conducting
information toward the next neuroninformation toward the next neuron
Postsynaptic neuronPostsynaptic neuron – transmits information away– transmits information away
from synapsefrom synapse
Most synaptic communication is via chemicalMost synaptic communication is via chemical
messengersmessengers (e.g. acetylcholine, serotonin,(e.g. acetylcholine, serotonin,
norepinephrine, dopamine, endorphins, GABA,norepinephrine, dopamine, endorphins, GABA,
glycine, glutamic acid, etc.)glycine, glutamic acid, etc.)
38. Types of synapses
Axodendritic = axon to dendriteAxodendritic = axon to dendrite
Axosomatic = axon to cell bodyAxosomatic = axon to cell body
Axoaxonic = axon to axonAxoaxonic = axon to axon
41. Types of Neuronal Integration
Neurons form many different types of connectionsNeurons form many different types of connections
and in so doing can result in finite control over theand in so doing can result in finite control over the
neuronal circuits.neuronal circuits.
Such pathways may create converging, diverging orSuch pathways may create converging, diverging or
reverberating circuits as is shown in the next slide.reverberating circuits as is shown in the next slide.
Such circuits may produce EPSP’s or IPSP’s and helpSuch circuits may produce EPSP’s or IPSP’s and help
modulate the neuronal signals.modulate the neuronal signals.
43. Axonal regeneration
Nerve tracts in the CNS are incapable of regeneration on theirNerve tracts in the CNS are incapable of regeneration on their
own and there may be hope for stem cells carrying out thisown and there may be hope for stem cells carrying out this
process.process.
In the PNS, nerves can regenerate but vey slowly and underIn the PNS, nerves can regenerate but vey slowly and under
only ideal conditions. Regeneration is dependent on 3 things:only ideal conditions. Regeneration is dependent on 3 things:
(a). Amount of damage, (b). Neurolemocyte secretion of nerve(a). Amount of damage, (b). Neurolemocyte secretion of nerve
growth factor and (c). The distance from the site of thegrowth factor and (c). The distance from the site of the
damage to the end organ being reinnervated.damage to the end organ being reinnervated.
Regeneration occurs at a rate of ~ 1 to 5 mm/day.Regeneration occurs at a rate of ~ 1 to 5 mm/day.
48. HOW THUS THE SIGNALINGHOW THUS THE SIGNALING
PROCESS IS DONE?PROCESS IS DONE?
THE INFORMATION IS CONDUCTED BYTHE INFORMATION IS CONDUCTED BY
THE WORKING OF NaTHE WORKING OF Na