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Mizzou Anatomy Lab 9 With 100% Correct Solutions
Typology: Exams
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pairs of spinal nerves -8 cervical -12 thoracic -5 lumbar -5 sacral -1 coccygeal
conus medullaris -located @ the end of the spinal cord -ends @ L1 in adults -ends @ L4 in kids
cauda equina bundle of nerve roots
filum teminale -long filament that extends from conus medullaris to coccyx -acts as a tether
spinal cord protection -bone, meninges (same as brain) & CSF -has an epidural space filled w/ fat & veins
denticulate liagaments (spinal cord protection) anchor spinal cord to dura matter
spinal cord grey matter -dark matter forms an "H' -white matter surrounds the "H" -posterior = dorsal horns -anterior = ventral horns
how the dorsal horn receives info -info from sensory neurons lies in the dorsal root ganglia -sensory neurons then reach the dorsal horn via the dorsal root
how the ventral horn sends out info -ventral horn sends out info to the skeletal muscle -signals going out travel via ventral roots
basics of spinal nerves -dorsal & ventral roots merge to form spinal nerve -spinal nerve has both sensory & motor axons -nerves exit @ intervertebral formina -then splits in dorsal & ventral rami (ramus)
dorsal & ventral rami (ramus) -both rami carry sensory & motor fibers
