ch. 13 - testing your recall

In the ____ reflex, contraction of flexor muscles in one limb is accompanied by the contraction of extensor muscles in the contralateral limb.

crossed extension

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

decussation

modified muscle fibers serving primarily to detect stretch are called ____.

intrafusal fibers

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

none of them

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

the cauda equina

the brachial plexus gives to all of the following nerves except

the obturator nerve

the outermost connective tissue wrapping of a nerve is called the

epineurium

nerve fibers that adjust the tension in a muscle spindle are called

gamma motor neurons

outside the CNS, the somas of neurons are clustered in swellings called____.

ganglia

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

pelvic

The ____ nerves arise from the cervical plexus and innervate the diaphragm.

phrenic

the _____ ganglion contains the somas of neurons that carry sensory signals to the spinal cord.

posterior root

the nonvisual awareness of the body's position and movements is called ____.

proprioception

Distal to the intervertebral foramen, a spinal nerve branches into an anterior and posterior _____.

ramus

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

reciprocal inhibition

The cerebellum receives feedback from the muscles and joints by way of the _____ tracts of the spinal cord.

spinocerebellar

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 the level of the body down. Most like, the ___ was damaged.

spinothalamic tract

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

the anterior horns

all somatic reflexes share all of the following properties except

they are monosynaptic

the sciatic nerve is a composite of two nerves, the ___- and ____.

tibial, common fibular