spinal cord extends from the _______________ to
_______________
foramen magnum, L1 or L2
length and width of spinal cord
17 inches and 3/4 inches wide
spinal cord is surrounded by 3 layers of
meninges
spinal cord terminates in a tapering cone shaped structure called
conus medullaris
fibrous extension of the conus medullaris, that extends to the coccyx to keep it stable
filum terminal
saw-tooth shelves of piamater that attach to the dura mater to keep the cord stable
denticulate ligaments
the two regions of the spinal cord that are enlarged
cervical and lumbar
why are the cervical and lumbar regions enlarged
it's the place where the upper and lower limbs arise.
the collection of nerve roots at the inferior end of the vertebral canal is
cauda equina
neurons that reside in the ganglion and conducts impulses from the skin to the spinal cord where they synapse with another order neurons
first order ascending neurons
neurons that reside in the dorsal horn of the spinal cord or in medullary nuclei that transmit impulses to the thalamus or the cerebellum where they synapse
second order ascending neurons
neurons that have cell bodies in the thalamus and transmit impulses to the post central gyri of the cerebrum hemesphere
third order ascending neurons