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bundles of fibers passing information up and down the spinal cord connecting different levels of the trunck with each other and with the brain
fibrous strand of pia mater that extends beyond the medullary cone within the lumbar cistem
congenital defect in which one or more vertebrea fail to form a complete vertebral arch for enclosure of the spinal cord
lateral and anterior column; sensation of ligh touch, tickle, temperature, pain and pressure
descending tract; balance and posture; subconscious movement; controls muscles of upper and lower limbs
caused by poliovirus; destroys motor neurons in brainstem and anterior horn of spinal cord; muscle pain, weakness and loss of some reflexes; fecal contamination of water
lou gehrig diseas; distruction of muscular atrophy; astrocytes fail to reabsorb the neurotransmitter glutamate from the tissue fluid
innervates the muscles and joints in that region of the spine and the skin of the back
dorsal root ganglion
contains the somas of sensory neurons carrying signals tot he spinal cord ; 6-8 roots that enter posterior horn of cord
lower back; L1-L4; supplies abdominal wall and anterior thigh and genatalia; femoral nerve
in the pelvis; L4,L5 and S1 to S4; supplies remainder of lower trunck and lower limb; sciatic nerve(longest largest nerve in body)
spinal reflex arc
somatic receptors; afferent nerve fibers; intergrating center; efferent nerve fibers; skeletal muscle
when a muscle is stretched it fights back and contracts which maintains increased tonus, making it stiffer than unstretched muscles; helps maintain equilibruim and posture ex. patellar tendon reflex arc.(knee jerk)
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