chapter 13 A&P1 Lecture

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 except

The obturator nerve

Nerve fibers that adjust the tension in a 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

Which 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 the

epineurium

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

1. cervical

2. brachial

3. lumbar

4. sacral

5. none of them

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 swellings called

Ganglia

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

Ramus

The cerebellum receives feedback fi 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