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