The Nervous System - Canton Local Schools
... Neuron: a nerve cell. The basic building block of the nervous system Dendrite: The bushy, branching extensions of a neuron that receive messages and conduct impulses toward cell body Axon: the extension of a neuron, ending in branching terminal fibers. Used to pass messages to other neurons or musc ...
... Neuron: a nerve cell. The basic building block of the nervous system Dendrite: The bushy, branching extensions of a neuron that receive messages and conduct impulses toward cell body Axon: the extension of a neuron, ending in branching terminal fibers. Used to pass messages to other neurons or musc ...
Neuron Structure and Function
... • Myelin – insulating layer of lipid-rich Schwann cells wrapped around the axon • Glial cells – supportive neural cells, e.g., Schwann cells ...
... • Myelin – insulating layer of lipid-rich Schwann cells wrapped around the axon • Glial cells – supportive neural cells, e.g., Schwann cells ...
A3 - Viktor`s Notes for the Neurosurgery Resident
... magnitude - LOCAL RESPONSE (i.e. slight active contribution to depolarizing process); however, repolarizing forces are stronger than depolarizing forces, and potential decays. – when cathodal stimulation is great enough to produce 15 mV depolarization (i.e. firing level of -55 mV membrane potential ...
... magnitude - LOCAL RESPONSE (i.e. slight active contribution to depolarizing process); however, repolarizing forces are stronger than depolarizing forces, and potential decays. – when cathodal stimulation is great enough to produce 15 mV depolarization (i.e. firing level of -55 mV membrane potential ...
Chapter 17:
... This sudden rise in Ca2+ causes synaptic vesicles to move and merge with the presynaptic membrane, releasing their neurotransmitter molecules into the synapse The binding of the neurotransmitter to receptors in the postsynaptic membrane causes either excitation or ...
... This sudden rise in Ca2+ causes synaptic vesicles to move and merge with the presynaptic membrane, releasing their neurotransmitter molecules into the synapse The binding of the neurotransmitter to receptors in the postsynaptic membrane causes either excitation or ...
chapter 44 lecture slides
... • Vertebrates have three types of neurons 1. Sensory neurons (afferent neurons) carry impulses to central nervous system (CNS) 2. Motor neurons (efferent neurons) carry impulses from CNS to effectors (muscles and glands) 3. Interneurons (association neurons) provide more complex reflexes and associa ...
... • Vertebrates have three types of neurons 1. Sensory neurons (afferent neurons) carry impulses to central nervous system (CNS) 2. Motor neurons (efferent neurons) carry impulses from CNS to effectors (muscles and glands) 3. Interneurons (association neurons) provide more complex reflexes and associa ...
Resting potential, action potential and electrotonic potentials
... During the AP, the activated Na+ channels become inactivated and they remain in this state until the membrane potential returns again to the resting potential!! ...
... During the AP, the activated Na+ channels become inactivated and they remain in this state until the membrane potential returns again to the resting potential!! ...
Lecture #13 – Animal Nervous Systems
... along the axon by depolarizing adjacent regions of the membrane past the threshold • Depolarization zone travels in one direction only due to the refractory period (Na+ gates locked) ...
... along the axon by depolarizing adjacent regions of the membrane past the threshold • Depolarization zone travels in one direction only due to the refractory period (Na+ gates locked) ...
chapter 44 lecture slides
... • Vertebrates have three types of neurons 1. Sensory neurons (afferent neurons) carry impulses to central nervous system (CNS) 2. Motor neurons (efferent neurons) carry impulses from CNS to effectors (muscles and glands) 3. Interneurons (association neurons) provide more complex reflexes and associa ...
... • Vertebrates have three types of neurons 1. Sensory neurons (afferent neurons) carry impulses to central nervous system (CNS) 2. Motor neurons (efferent neurons) carry impulses from CNS to effectors (muscles and glands) 3. Interneurons (association neurons) provide more complex reflexes and associa ...
File
... Many layers of myelin are deposited around the axon by special cells called Schwann cells The myelin sheath insulates the axon and greatly increases the speed of the nerve impulse In between the myelin are gaps called the nodes of Ranvier In myelinated neurons, the impulse can jump from one ...
... Many layers of myelin are deposited around the axon by special cells called Schwann cells The myelin sheath insulates the axon and greatly increases the speed of the nerve impulse In between the myelin are gaps called the nodes of Ranvier In myelinated neurons, the impulse can jump from one ...
Chapter 22 The Nervous System Nervous System - Function 6/1/2013
... Nerve Impulse travels w/ microelectrical impulses. ...
... Nerve Impulse travels w/ microelectrical impulses. ...
Lect5
... Na flowing into the cell exactly equals the K flowing out of the cell • A fraction more stimulus depolarization is required to ‘fire’ an action potential ...
... Na flowing into the cell exactly equals the K flowing out of the cell • A fraction more stimulus depolarization is required to ‘fire’ an action potential ...
36.1: The Nervous System
... Neurons: Basic Units of the Nervous System • Dendrites~ receive impulses and carry them toward the cell body • Axon~ carries impulses away from the cell body and toward other neurons, muscles, or glands. • Cell body~ contains the nucleus ...
... Neurons: Basic Units of the Nervous System • Dendrites~ receive impulses and carry them toward the cell body • Axon~ carries impulses away from the cell body and toward other neurons, muscles, or glands. • Cell body~ contains the nucleus ...
action potential presen - Westgate Mennonite Collegiate
... Multiple cells provide input Input is received in different areas Input is summated to create a larger potential ...
... Multiple cells provide input Input is received in different areas Input is summated to create a larger potential ...
2_DNA_structure
... The cell mem consists of three classes of amphipathic lipids: PHOSPOLIPIDS, GLYCOLIPIDS, STEROIDS Membrane is held together via weak non-covalent interaction of hydrophobic tails Structure is fluid and not fixed rigidly in place. Phospholipid molecules are “fluid”: free to diffuse and exhibit rapid ...
... The cell mem consists of three classes of amphipathic lipids: PHOSPOLIPIDS, GLYCOLIPIDS, STEROIDS Membrane is held together via weak non-covalent interaction of hydrophobic tails Structure is fluid and not fixed rigidly in place. Phospholipid molecules are “fluid”: free to diffuse and exhibit rapid ...
Cells of the Nervous System
... on each other - when poking the marble in one end then each marble only moves slightly, but this small effect on the marble in the other end is almost instantaneous, like a one-way Newton's cradle. So the signal moves at the speed of light between each node. •Thus in myelinated axons, action potenti ...
... on each other - when poking the marble in one end then each marble only moves slightly, but this small effect on the marble in the other end is almost instantaneous, like a one-way Newton's cradle. So the signal moves at the speed of light between each node. •Thus in myelinated axons, action potenti ...
Nervous System – Chapter 10
... 3. The strength of the nerve impulse remains constant because the nerve supplies the energy 4. All or none – all fibers respond in the nerve or none do 5. Impulse conduction a. unmyelinated nerve fibers conduct an impulse over the entire nerve surface b. a myelinated fiber is different because myeli ...
... 3. The strength of the nerve impulse remains constant because the nerve supplies the energy 4. All or none – all fibers respond in the nerve or none do 5. Impulse conduction a. unmyelinated nerve fibers conduct an impulse over the entire nerve surface b. a myelinated fiber is different because myeli ...
Document
... *mature neurons generally do not reproduce *2 kinds of nerve fibers: *(1) dendrites –nerve fibers (many) that extend from the neuron; highly branched, can have dendritic spines = that can contact other neurons *dendrites provide the main receptive surfaces for neurons *(2) axon – a single nerve fibe ...
... *mature neurons generally do not reproduce *2 kinds of nerve fibers: *(1) dendrites –nerve fibers (many) that extend from the neuron; highly branched, can have dendritic spines = that can contact other neurons *dendrites provide the main receptive surfaces for neurons *(2) axon – a single nerve fibe ...
Chapter 24
... Conduction along myelinated fibers is known as saltatory conduction because sodium ions are especially abundant in this kind of fiber. the sodium pump is responsible for generating action potentials. action potentials are generated only between nodes. the “all-or-none” threshold “jumps” in this kind ...
... Conduction along myelinated fibers is known as saltatory conduction because sodium ions are especially abundant in this kind of fiber. the sodium pump is responsible for generating action potentials. action potentials are generated only between nodes. the “all-or-none” threshold “jumps” in this kind ...
The Nervous System
... electrical signals to communicate with other cells • An impulse is: an electrical signal travelling through a neuron • A nerve is: a bundle of neurons • Sensory neurons: carry impulses from receptors (e.g. in skin) to the central nervous system (brain/spinal cord) • Motor neurons: carry impulses fro ...
... electrical signals to communicate with other cells • An impulse is: an electrical signal travelling through a neuron • A nerve is: a bundle of neurons • Sensory neurons: carry impulses from receptors (e.g. in skin) to the central nervous system (brain/spinal cord) • Motor neurons: carry impulses fro ...
MS Word Version - Interactive Physiology
... b. support cells in the peripheral nervous system which produce myelin. c. The process of the formation of the myelin sheath. 21. (Page 10.) What is the myelin sheath made of in the peripheral nervous system? 22. (Page 11.) Label the diagram on p. 11. 23. (Page 11.) What are the gaps in the myelin s ...
... b. support cells in the peripheral nervous system which produce myelin. c. The process of the formation of the myelin sheath. 21. (Page 10.) What is the myelin sheath made of in the peripheral nervous system? 22. (Page 11.) Label the diagram on p. 11. 23. (Page 11.) What are the gaps in the myelin s ...
Anatomy Review - Interactive Physiology
... b. support cells in the peripheral nervous system which produce myelin. c. The process of the formation of the myelin sheath. 21. (Page 10.) What is the myelin sheath made of in the peripheral nervous system? 22. (Page 11.) Label the diagram on p. 11. 23. (Page 11.) What are the gaps in the myelin s ...
... b. support cells in the peripheral nervous system which produce myelin. c. The process of the formation of the myelin sheath. 21. (Page 10.) What is the myelin sheath made of in the peripheral nervous system? 22. (Page 11.) Label the diagram on p. 11. 23. (Page 11.) What are the gaps in the myelin s ...
Neurons and the General Layout of the Nervous System - U
... Glial Cells and Satellite Cells • the glial cells and satellite cells that form the myelin sheaths of axons in the CNS and PNS are oligodendroglia and Schwann cells, respectively • Only Schwann cells are regenerative. Damage is permanent if it occurs in oligodendroglia (cause of Parkinson’s, degene ...
... Glial Cells and Satellite Cells • the glial cells and satellite cells that form the myelin sheaths of axons in the CNS and PNS are oligodendroglia and Schwann cells, respectively • Only Schwann cells are regenerative. Damage is permanent if it occurs in oligodendroglia (cause of Parkinson’s, degene ...
The Nervous System (PowerPoint)
... Each axon branches off and ends with a swelled tip or terminal knob lies close to but not touching the dendrite of another neuron. (or an organ). The entire region is called a synapse. Transmission of nerve impulses across a Synaptic cleft is carried out by chemicals called Neurotransmitters substan ...
... Each axon branches off and ends with a swelled tip or terminal knob lies close to but not touching the dendrite of another neuron. (or an organ). The entire region is called a synapse. Transmission of nerve impulses across a Synaptic cleft is carried out by chemicals called Neurotransmitters substan ...
Schwann cells
... 5. increase the speed of impulse conduction 6. non-myelinated axons are slower 7. nodes of Ranvier – gaps between the surrounding cells ...
... 5. increase the speed of impulse conduction 6. non-myelinated axons are slower 7. nodes of Ranvier – gaps between the surrounding cells ...
Node of Ranvier
The nodes of Ranvier also known as myelin sheath gaps, are the gaps (approximately 1 micrometer in length) formed between the myelin sheaths generated by different cells. A myelin sheath is a many-layered coating, largely composed of a fatty substance called myelin, that wraps around the axon of a neuron and very efficiently insulates it. At nodes of Ranvier, the axonal membrane is uninsulated and, therefore, capable of generating electrical activity.