Pathology of the Peripheral Nervous System
... Regeneration occurs (no gliosis in PNS) regenerative clusters – small groups of tiny myelinated axons Wallerian Degeneration – the changes occuring distally to the site of transection of a peripheral nerve or damage to a cell body ...
... Regeneration occurs (no gliosis in PNS) regenerative clusters – small groups of tiny myelinated axons Wallerian Degeneration – the changes occuring distally to the site of transection of a peripheral nerve or damage to a cell body ...
Basic Structure and Function of Neurons
... 4 Motor and Nerve Activities (1)Integration of neuronal Activity in Movement The principle of reciprocal inhibition is one example of such integration. Their collaterals, releasing the same transmitter ,at the same time excite inhibitory interneurons, which in turn inhibit the motoneurons to antago ...
... 4 Motor and Nerve Activities (1)Integration of neuronal Activity in Movement The principle of reciprocal inhibition is one example of such integration. Their collaterals, releasing the same transmitter ,at the same time excite inhibitory interneurons, which in turn inhibit the motoneurons to antago ...
Chapter 6
... Consist of collections of specialized muscle fibers known as intrafusal fibers Lie within spindle-shaped connective tissue capsules parallel to extrafusal fibers Each spindle has its own private efferent and afferent nerve supply Play key role in stretch reflex ...
... Consist of collections of specialized muscle fibers known as intrafusal fibers Lie within spindle-shaped connective tissue capsules parallel to extrafusal fibers Each spindle has its own private efferent and afferent nerve supply Play key role in stretch reflex ...
The Nervous System - Liberty Union High School District
... Station 2: Nerve Damage The nervous system is responsible for muscular contractions that produce heat, and therefore sweat. When the nerve to a specific muscle is damaged, it will not send the signal to contract to that portion of muscle, and no sweating will occur in that area. Nerve damage can res ...
... Station 2: Nerve Damage The nervous system is responsible for muscular contractions that produce heat, and therefore sweat. When the nerve to a specific muscle is damaged, it will not send the signal to contract to that portion of muscle, and no sweating will occur in that area. Nerve damage can res ...
the nervous system - Fullfrontalanatomy.com
... Within a nerve, each axon is covered by Schwann cells (myelin) Schwann cells are covered in a thin layer of loose connective tissue called Endoneurium Groups of axons are bound into bundles called nerve fascicles (similar to muscles) with a covering call the Perineurium The whole nerve is covered by ...
... Within a nerve, each axon is covered by Schwann cells (myelin) Schwann cells are covered in a thin layer of loose connective tissue called Endoneurium Groups of axons are bound into bundles called nerve fascicles (similar to muscles) with a covering call the Perineurium The whole nerve is covered by ...
Chapters 13, and 14
... Sensory receptors in the muscles, joints and tendons, other internal organs, and skin send nerve impulses to the spinal cord. These general sensory receptors are categorized as follows: Proprioceptors Proprioceptors are mechanoreceptors involved in reflex actions that maintain muscle tone, and there ...
... Sensory receptors in the muscles, joints and tendons, other internal organs, and skin send nerve impulses to the spinal cord. These general sensory receptors are categorized as follows: Proprioceptors Proprioceptors are mechanoreceptors involved in reflex actions that maintain muscle tone, and there ...
NERVOUS TISSUE The nervous system consists of all nervous
... the main transmitters, and this transmitter is used at all synaptic boutons that originate from the neuron. One or more of the "minor" transmitters (there are several dozens of them - such as cholecystokinin, endogenous opioids, somatostatin, substance P) may be used together with a main transmitter ...
... the main transmitters, and this transmitter is used at all synaptic boutons that originate from the neuron. One or more of the "minor" transmitters (there are several dozens of them - such as cholecystokinin, endogenous opioids, somatostatin, substance P) may be used together with a main transmitter ...
Learning about Learning - by Directly Driving Networks of Neurons
... New behaviors require new patterns of neural activity among the population of neurons that control behavior. How can the brain find a pattern of activity appropriate for the desired behavior? Why does that learning process take time? To tackle questions like these, we reverse the normal order of ope ...
... New behaviors require new patterns of neural activity among the population of neurons that control behavior. How can the brain find a pattern of activity appropriate for the desired behavior? Why does that learning process take time? To tackle questions like these, we reverse the normal order of ope ...
Sensory, Motor, and Integrative Systems
... • Corpuscles of touch (Meissner) - connective tissue enclosure in dermal papillae, for discriminative touch, adapt rapidly – 40% of tactile receptors in hands and also tongue, lips, nipples, clitoris & penis • Hair root plexuses - dendrite wrapped around follicle, respond to hair movement, adapt rap ...
... • Corpuscles of touch (Meissner) - connective tissue enclosure in dermal papillae, for discriminative touch, adapt rapidly – 40% of tactile receptors in hands and also tongue, lips, nipples, clitoris & penis • Hair root plexuses - dendrite wrapped around follicle, respond to hair movement, adapt rap ...
The Special Senses
... • Includes senses that are associated with skin – Temperature, pressure, touch, pain, vibration, proprioception ...
... • Includes senses that are associated with skin – Temperature, pressure, touch, pain, vibration, proprioception ...
Ice Ice Baby: Effects of Temperature on Typing Speed
... • Immersion of a body part in cold water can cause neuromuscular fatigue 1. Neuromuscular fatigue is the decrease in muscle output caused by a continuous amount of force 2. • Nerve conduction velocity is influenced by nerve temperature in peripheral nerve fibers 3. • Temperature may affect the activ ...
... • Immersion of a body part in cold water can cause neuromuscular fatigue 1. Neuromuscular fatigue is the decrease in muscle output caused by a continuous amount of force 2. • Nerve conduction velocity is influenced by nerve temperature in peripheral nerve fibers 3. • Temperature may affect the activ ...
Fundamentals on Peripheral Nerves
... Afferent fibers conduct impulses toward the central nervous system. They are processes (axons) of nerve cell bodies located in the dorsal root ganglia of spinal nerves or in equivalent ganglia on cranial nerves (V, VII, VIII, IX, and X). (Although cranial nerves I and II are special sensory nerves, ...
... Afferent fibers conduct impulses toward the central nervous system. They are processes (axons) of nerve cell bodies located in the dorsal root ganglia of spinal nerves or in equivalent ganglia on cranial nerves (V, VII, VIII, IX, and X). (Although cranial nerves I and II are special sensory nerves, ...
Nervous System: General Principles
... segment of a single axon • In the CNS, an oligodendrocyte performs the same function but can attach to more than one axon ...
... segment of a single axon • In the CNS, an oligodendrocyte performs the same function but can attach to more than one axon ...
The Peripheral Nervous System
... Example: The abducens nerve (VI) originates from the pons and exits the skull through the superior orbital fissure. It innervates the lateral rectus muscle which causes the eye to rotate laterally. Injury to this nerve on either side causes an inability to rotate that eye laterally, and unopposed fu ...
... Example: The abducens nerve (VI) originates from the pons and exits the skull through the superior orbital fissure. It innervates the lateral rectus muscle which causes the eye to rotate laterally. Injury to this nerve on either side causes an inability to rotate that eye laterally, and unopposed fu ...
Transcripts/2_9 2
... Fine touch or dorsal column/medial lemniscal pathway [S28] a. Named such because it travels up the dorsal column of the spinal cord and once it crosses over at the level of the brainstem it travels up the medial lemniscus b. Axons from primary neurons enter spinal cord via dorsal roots and ascend ip ...
... Fine touch or dorsal column/medial lemniscal pathway [S28] a. Named such because it travels up the dorsal column of the spinal cord and once it crosses over at the level of the brainstem it travels up the medial lemniscus b. Axons from primary neurons enter spinal cord via dorsal roots and ascend ip ...
The Nervous System
... Peripheral nerves carry impulses from receptors in skin, eyes, ears nose to CNS. ...
... Peripheral nerves carry impulses from receptors in skin, eyes, ears nose to CNS. ...
1 Revised 10/11/2016 The Physiology of the Senses Lecture 7
... b) Which receptor has the largest receptive field size? Receptive field size increases with depth in the skin. Pacinian corpuscles have the largest receptive fields. Recall that it is the small receptive fields that allow for the perception of details. ...
... b) Which receptor has the largest receptive field size? Receptive field size increases with depth in the skin. Pacinian corpuscles have the largest receptive fields. Recall that it is the small receptive fields that allow for the perception of details. ...
The Nervous System - Appoquinimink High School
... 4. Helps maintain homeostasis by detecting changes either on the outside or inside and allowing your body to react appropriately. ...
... 4. Helps maintain homeostasis by detecting changes either on the outside or inside and allowing your body to react appropriately. ...
Nervous System Structure
... impulses faster than unmyelinated ones because the impulse jumps from one node of Ranvier to the next, instead of traveling along the whole length of the axon. ...
... impulses faster than unmyelinated ones because the impulse jumps from one node of Ranvier to the next, instead of traveling along the whole length of the axon. ...
Autonomic Nervous System
... body systems. Every activity is controlled by some of the more than 100 billion nerve cells in the body. CNS (Brain & Spinal Cord) – acts as a control center PNS (Nerves) – carry messages to and from this center ...
... body systems. Every activity is controlled by some of the more than 100 billion nerve cells in the body. CNS (Brain & Spinal Cord) – acts as a control center PNS (Nerves) – carry messages to and from this center ...
L19-Physiology of the Proprioceptors in Balance
... (1) nuclear bag muscle fibers (one to three in each spindle), in which several muscle fiber nuclei are meet in expanded "bags" (2) nuclear chain fibers (three to nine) half as large in diameter and half as long as the nuclear bag fibers and have nuclei aligned in a chain throughout the receptor area ...
... (1) nuclear bag muscle fibers (one to three in each spindle), in which several muscle fiber nuclei are meet in expanded "bags" (2) nuclear chain fibers (three to nine) half as large in diameter and half as long as the nuclear bag fibers and have nuclei aligned in a chain throughout the receptor area ...
Somatic and Special Senses
... 1. thin, unmyelinated nerve fibers 2. conduct impulses more slowly and produce a dull, aching sensation that may be diffuse and difficult to pinpoint 3. pain may continue for some time after the original stimulus ceases 4. felt from the skin as well as in deeper tissues ...
... 1. thin, unmyelinated nerve fibers 2. conduct impulses more slowly and produce a dull, aching sensation that may be diffuse and difficult to pinpoint 3. pain may continue for some time after the original stimulus ceases 4. felt from the skin as well as in deeper tissues ...
Somatic and Special Senses
... 1. thin, unmyelinated nerve fibers 2. conduct impulses more slowly and produce a dull, aching sensation that may be diffuse and difficult to pinpoint 3. pain may continue for some time after the original stimulus ceases 4. felt from the skin as well as in deeper tissues ...
... 1. thin, unmyelinated nerve fibers 2. conduct impulses more slowly and produce a dull, aching sensation that may be diffuse and difficult to pinpoint 3. pain may continue for some time after the original stimulus ceases 4. felt from the skin as well as in deeper tissues ...
Microneurography
Microneurography is a neurophysiological method employed by scientists to visualize and record the normal traffic of nerve impulses that are conducted in peripheral nerves of waking human subjects. The method has been successfully employed to reveal functional properties of a number of neural systems, e.g. sensory systems related to touch, pain, and muscle sense as well as sympathetic activity controlling the constriction state of blood vessels. To study nerve impulses of an identified neural system, a fine tungsten needle electrode is inserted into the nerve and connected to a high gain recording amplifier. The exact position of the electrode tip within the nerve is then adjusted in minute steps until the electrode discriminates impulses of the neural system of interest. A unique feature and a significant strength of the microneurography method is that subjects are fully awake and able to cooperate in tests requiring mental attention, while impulses in a representative nerve fibre or set of nerve fibres are recorded, e.g. when cutaneous sense organs are stimulated or subjects perform voluntary precision movements.