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Midterm

PSL300H1 Study Guide - Midterm Guide: Dorsal Root Ganglion, Dorsal Root Of Spinal Nerve, Grey Matter


Department
Physiology
Course Code
PSL300H1
Professor
Hae- Young Kee
Study Guide
Midterm

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SEGMENTAL STRUCTURE
spinal cord = 31 segments, each with pair of spinal nerves.
dorsal root incoming sensory signals.
dorsal root ganglion contains cell bodies of sensory neurons
ventral root signals from CNS to muscles/glands. 
NUCLEI AND TRACTS
gray matter in SC = sensory and motor nuclei
white matter = axon tracts: 
ascending tracts carry sensory info to brain
descending tracts carry efferent signals from the brain
propriospinal tracts in spinal cord, with gray matter.
SPINAL REFLEXES
cord responds to sensory signal w/o or before consulting brain.
sensory input interneuron motor output
motor output happens at ventral lvl. spinal cord mediates diff. reflexes, ex. knee jerk reflex.
dorsal root
dorsal root ganglion
ventral root
ascending tracts
descending tracts
propriospinal tracts
lateral at periphery
medial in middle of brain
white matter = outside, gray matter = inside. 
nuclei = groups of neuronal cell bodies w/
common
function (sensory/motor)
ex. motor nucleus = group of neurons involved in
moving particular muscle
no white matter tracts induced.
CNS - SPINAL CORD
May-25-131:42 PM
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