neurobio 917 ch 12 of Bear's book: the somatic sensory system part 4 (Pacinian corpuscle two-point

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Author:
mikepl103
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271116
Filename:
neurobio 917 ch 12 of Bear's book: the somatic sensory system part 4 (Pacinian corpuscle two-point
Updated:
2014-04-25 15:00:49
Tags:
neurobio 917 12 Bear book somatic sensory system part Pacinian corpuscle two point discrimination touch spinal segment dermatome dorsal column nociception spinothalamic pain pathway 27
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2014,biology,neurobiology
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neurobio 917 ch 12 of Bear's book: the somatic sensory system part 4 (Pacinian corpuscle, two-point discrimination, touch, spinal segment, dermatome, dorsal column, nociception, spinothalamic pain pathway) #27
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  1. what is the purpose of the capsule that surrounds the Pacinian corpuscle?
    when the capsule is compressed, energy is transferred to the nerve terminal, its membrane is deformed and mechanosensitive channels open. Current flowing through the channels generates a receptor potential which is depolarizing. If the depolarization is large enough, the axon will fire an action potential. But the capsule layers are slick, with viscous fluid between them. If the stimulus pressure is maintained, the layers slip past one another and transfer of stimulus energy in such a way that the axon terminal is no longer deformed and the receptor potential dissipates. When pressure is released, the events reverse themselves; the terminal depolarizes again and may fire another action potential.
  2. the Aδ and C fibers travel a short distance up and down the spinal cord in a region called the ___ __ ______, and then synapse on cells in the outer part of the dorsal horn in a region known as the ________ ________
    the Aδ and C fibers travel a short distance up and down the spinal cord in a region called the zone of lissauer, and then synapse on cells in the outer part of the dorsal horn in a region known as the substantia gelatinosa
  3. what kind of brain lesion causes neglect syndrome?
    a lesion of the parietal cortex

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