PSL300H1 Study Guide - Midterm Guide: Dorsal Root Ganglion, Dorsal Root Of Spinal Nerve, Grey Matter
ProfessorHae- Young Kee
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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.
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 ganglion
lateral → at periphery
medial → in middle of brain
white matter = outside, gray matter = inside.
nuclei = groups of neuronal cell bodies w/
ex. motor nucleus = group of neurons involved in
moving particular muscle
no white matter tracts induced.
CNS - SPINAL CORD
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