The Nervous System
... Myelination Fastest axons have a large diameter and are myelinated. How much faster? Up to 100 times faster! (Reflexes are this type) ...
... Myelination Fastest axons have a large diameter and are myelinated. How much faster? Up to 100 times faster! (Reflexes are this type) ...
Document
... – B. Peripheral (PNS) – Network of nerves that carry input from the body to the CNS and motor output away from CNS. – C. Neurons • 1. Specialized for transmitting chemical and electrical signals • 2. Large cell body – i. Contains most of the cytoplasm and nucleus of cell – ii. Usually in CNS or gang ...
... – B. Peripheral (PNS) – Network of nerves that carry input from the body to the CNS and motor output away from CNS. – C. Neurons • 1. Specialized for transmitting chemical and electrical signals • 2. Large cell body – i. Contains most of the cytoplasm and nucleus of cell – ii. Usually in CNS or gang ...
1. 2. a) Explain the compositions of white matter and gray matter
... left hemisphere is able to verbalize the information carried by visual stimuli, both hemispheres are able to process and comprehend the information. In what are now known as the split brain experiments, Sperry recruited a group of subjects who had undergone a surgical procedure where the nerve fiber ...
... left hemisphere is able to verbalize the information carried by visual stimuli, both hemispheres are able to process and comprehend the information. In what are now known as the split brain experiments, Sperry recruited a group of subjects who had undergone a surgical procedure where the nerve fiber ...
Unit 4 – Coordination Reflex Arc
... – Scars form in white matter of CNS – Cause unknown, no cure • Cerebral Palsy – Damage to developing oligodendrocytes usually during infancy – Mutations, lack of oxygen, interruption of blood flow – Treatment of symptoms, no cure ...
... – Scars form in white matter of CNS – Cause unknown, no cure • Cerebral Palsy – Damage to developing oligodendrocytes usually during infancy – Mutations, lack of oxygen, interruption of blood flow – Treatment of symptoms, no cure ...
File
... • Both of these give brain info on STRENGTH of stimulus • NATURE of stimulus determined from position of sensory neuron bringing in the info • If neuron is from the retina, brain interprets signal as light • If different stimulus stimulates receptor in retina (like pressure), brain can still interpr ...
... • Both of these give brain info on STRENGTH of stimulus • NATURE of stimulus determined from position of sensory neuron bringing in the info • If neuron is from the retina, brain interprets signal as light • If different stimulus stimulates receptor in retina (like pressure), brain can still interpr ...
p. A46 (5a) - Viktor`s Notes for the Neurosurgery Resident
... Segmental demyelination: random myelin internodes are injured and are remyelinated by multiple Schwann cells, while axon and myocytes remain intact. Axonal degeneration: axon and its myelin sheath undergo anterograde degeneration (shown for green neuron) → denervation atrophy of myocytes within its ...
... Segmental demyelination: random myelin internodes are injured and are remyelinated by multiple Schwann cells, while axon and myocytes remain intact. Axonal degeneration: axon and its myelin sheath undergo anterograde degeneration (shown for green neuron) → denervation atrophy of myocytes within its ...
Biology 12 Answers p. 352, 257
... 13. Resting membrane potential refers to the charge a neuron has at rest, when it is not actively sending a signal. It is maintained by the Na+/K+ pump. The resting potential is -70 mV and the inside of the membrane is negatively charged, and the outside is positively charged. 14. The three factors ...
... 13. Resting membrane potential refers to the charge a neuron has at rest, when it is not actively sending a signal. It is maintained by the Na+/K+ pump. The resting potential is -70 mV and the inside of the membrane is negatively charged, and the outside is positively charged. 14. The three factors ...
The Nervous System
... fibers; has waxy appearance Protects and provides an electrical insulation covering for large and long nerve fibers Increases speed of transmission of nerve impulses Unmyelinated fibers conduct impulses slowly Associated only with axons; Dendrites always unmyelinated Formed by Schwann cell ...
... fibers; has waxy appearance Protects and provides an electrical insulation covering for large and long nerve fibers Increases speed of transmission of nerve impulses Unmyelinated fibers conduct impulses slowly Associated only with axons; Dendrites always unmyelinated Formed by Schwann cell ...
Homework - Nerve Cells
... 1. The two basic cells found I the nervous system is __________ and _________cells. 2. Nerves are bundles of A) axons. B) dendrites. C) axons and dendrites. 3. The functions of neuroglia include A) support of neurons B) filling spaces C) sending and receiving messages D) all of the above 4. The spac ...
... 1. The two basic cells found I the nervous system is __________ and _________cells. 2. Nerves are bundles of A) axons. B) dendrites. C) axons and dendrites. 3. The functions of neuroglia include A) support of neurons B) filling spaces C) sending and receiving messages D) all of the above 4. The spac ...
p. A5 - Viktor`s Notes for the Neurosurgery Resident
... abnormally reinnervate 3-4 end-cells. Presence of multiple, closely aggregated, thinly myelinated small-caliber axons is evidence of regeneration (regenerating cluster). – axon regrowth is slow process (limited by slow component of axonal transport, movement of tubulin, actin, intermediate filaments ...
... abnormally reinnervate 3-4 end-cells. Presence of multiple, closely aggregated, thinly myelinated small-caliber axons is evidence of regeneration (regenerating cluster). – axon regrowth is slow process (limited by slow component of axonal transport, movement of tubulin, actin, intermediate filaments ...
The Nervous System
... – Sites where axon collaterals can emerge – Formerly called nodes of Ranvier ...
... – Sites where axon collaterals can emerge – Formerly called nodes of Ranvier ...
The Nervous System
... •These are the support cells in the peripheral nervous system. •Schwann cells provide the myelin sheath for peripheral axons. •Satellite cells serve a slightly similar function to astrocytes, supporting the cell bodies of peripheral neurons. ...
... •These are the support cells in the peripheral nervous system. •Schwann cells provide the myelin sheath for peripheral axons. •Satellite cells serve a slightly similar function to astrocytes, supporting the cell bodies of peripheral neurons. ...
File
... 2. Integration: Interpretation of sensory signals and development of a response. Occurs in brain and spinal cord. 3. Motor Output: Conduction of signals from brain or spinal cord to effector organs (muscles or glands). Controls the activity of muscles and glands, and allows the animal to ...
... 2. Integration: Interpretation of sensory signals and development of a response. Occurs in brain and spinal cord. 3. Motor Output: Conduction of signals from brain or spinal cord to effector organs (muscles or glands). Controls the activity of muscles and glands, and allows the animal to ...
Power Point
... Photo caption: An adult rat nerve cell called a neuron normally grows or regenerates only poorly (red-colored nerve cell at top of photo taken through a microscope). But when a neuroscientist manipulated an integrin gene, the adult neuron (green) displayed extensive regenerative growth by extending ...
... Photo caption: An adult rat nerve cell called a neuron normally grows or regenerates only poorly (red-colored nerve cell at top of photo taken through a microscope). But when a neuroscientist manipulated an integrin gene, the adult neuron (green) displayed extensive regenerative growth by extending ...
Slide () - Anesthesiology - American Society of Anesthesiologists
... protein (MBP). A presents an overview showing different stages of myelination at a midrostrocaudal level of a control brain. In the cerebrocortical mantel, and in the transition zone between gray and white matter, there is no myelination. But in the subjacent corona radiata (CR) oligodendrocytes are ...
... protein (MBP). A presents an overview showing different stages of myelination at a midrostrocaudal level of a control brain. In the cerebrocortical mantel, and in the transition zone between gray and white matter, there is no myelination. But in the subjacent corona radiata (CR) oligodendrocytes are ...
lecture 14 File
... • Apical ends of some cells have cilia to facilitate the movement of CSF • No basal lamina. Instead the basal ends are elongated & extended branch processes ...
... • Apical ends of some cells have cilia to facilitate the movement of CSF • No basal lamina. Instead the basal ends are elongated & extended branch processes ...
The Nervous System Ch. 12 & 13
... The action potential causes an electrical current to flow down segments of the axon’s membrane. It will never move backward due to the refractory period of the membrane before the AP. In myelinated fibers, the myelin sheath prevents ion movement, so electrical changes only occur in the gaps bet ...
... The action potential causes an electrical current to flow down segments of the axon’s membrane. It will never move backward due to the refractory period of the membrane before the AP. In myelinated fibers, the myelin sheath prevents ion movement, so electrical changes only occur in the gaps bet ...
Nervous System
... Most caudal portion of the Central Nervous System Continuation of medulla Segmented, 31 pairs of spinal nerves ...
... Most caudal portion of the Central Nervous System Continuation of medulla Segmented, 31 pairs of spinal nerves ...
THE BRAIN - Dublin City Schools
... • Drugs can have powerful control of the brain stem and limbic system. • These systems can override our cortex in controlling our behavior. So, we do things without thinking! ...
... • Drugs can have powerful control of the brain stem and limbic system. • These systems can override our cortex in controlling our behavior. So, we do things without thinking! ...
Unit V Anatomy and Physiology of Plants, Animals, and Humans
... Gaps between each Schwann cell on the axon, called nodes of Ranvier expose the axon membrane directly to extracellular fluid, speeding the rate of electrical impulses. ...
... Gaps between each Schwann cell on the axon, called nodes of Ranvier expose the axon membrane directly to extracellular fluid, speeding the rate of electrical impulses. ...
Nervous System
... • Action potential triggers an influx of calcium • Synaptic vesicles fuse with presynaptic membrane • Neurotransmitter released into synaptic cleft • Neurotransmitters bind to receptors and open ion channels on postsynaptic membrane which sets off new action potential • Neurotransmitters are degrade ...
... • Action potential triggers an influx of calcium • Synaptic vesicles fuse with presynaptic membrane • Neurotransmitter released into synaptic cleft • Neurotransmitters bind to receptors and open ion channels on postsynaptic membrane which sets off new action potential • Neurotransmitters are degrade ...
nerve cell
... damaged axons or dendrites • Outside of brain and spinal cord, only if cell body is not damaged ...
... damaged axons or dendrites • Outside of brain and spinal cord, only if cell body is not damaged ...
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.