Nervous system book notes

Below L2, the vertebral canal is occupied by a bundle of spinal nerve roots called

the cauda equina

The brachial plexus gives rise to all of the following nerves expect

the obturator nerve

nerve fibers that adjust the tension in muscle spindle are called

gamma motor neurons 

a stretch reflex requires the action of ——— to prevent an antagonistic muscle from interfering with the agonist 

reciprocal inhibition 

a patient has a gunshot wound that caused a bone fragment to nick the spinal cord. The patient now feels no pain or temperature sensations from that level of the body down. Most likely, the ——- was damaged.

spinothalamic tract

what of these is not a region of the spinal cord?

pelvic

In the spinal cord, the cell bodies of the lower motor neurons are found in 

the anterior horns

The outermost connective tissue wrapping of a nerve is called

epineurium

the intercostal nerves between the ribs arise from which spinal nerve plexus

none of them 

All somatic reflexes share all of the following properties except

they are monosynaptic

outside the CNS, the cell bodies of neurons are clustered in a swelling called the posterior

ganglia

distal to the intervertebral foramen, a spinal nerve branches into an anterior and a posterior

ramus

the cerebellum receives feedback from the muscles and joints by way of the ——-tracts of the spinal cord.

spinocerebellar

in the ——— reflex, contraction of flexor muscles in one limb is accompanied by the contraction of extensor muscles in the contralateral limb

crossed extension

Modified muscle fibers serving primarily to detect stretch are called

intrafusal fibers

the ——- nerves arise from the cervical plexus and innervate the diaphragm

phrenic

the crossing of a nerve fiber or tract from the right side of the CNS to the left, or vice versa, is called ———. 

decussation 

The nonvisual awareness of the body’s position and movements is called

proprioception

the ——- ganglion contains the cell bodies of neurons that carry sensory signals to the spinal cord

posterior root

The sciatic nerve is a composite of two nerves: the ——- and——. 

tibial, common fibular