13. The Peripheral Nervous System

Which contains only motor fibers?

The major nerve of the cervical plexus that innervates the diaphragm is the

(a) Median nerve

(b) Axillary nerve

(c) Phrenic nerve

(d) Common fibular nerve

Cranial nerves that have some function in vision include the:

a. Trochlear

b. Trigeminal

c. Abducens

d. Facial.

The genitofemoral, femoral, and lateral femoral cutaneous nerves are major nerves of the

(a) Lumbar plexus

(b) Sacral plexus

(c) Brachial plexus

(d) Cervical plexus

Motor functions of the extensor muscles of the arm, forearm, and fingers would be affected by damage to which one of these nerves?

a. Radial

b. Axillary

c. Ulnar

d. Median

List the names of the 12 pairs of cranial nerves. (Hint: use the mnemonic device 'Oh, Once One Takes The Anatomy Final, Very Good Vacations Are Heavenly.' )

Damage to the posterior spinocerebellar tract on the left side of the spinal cord at the L₁ level would interfere with the coordinated movement of which limb(s)?

How many pairs of cranial nerves are there? Which are purely sensory? Which activates the chewing muscles? Which helps regulate heart rate and activity of the digestive tract?

What region of the body is served by the dorsal rami of the spinal nerves? By the ventral rami?

The only cranial nerves that are attached to the cerebrum are the____ nerves.

(a) optic

(b) oculomotor

(c) trochlear

(d) olfactory

(e) abducens

Why do cervical nerves outnumber cervical vertebrae?

Joseph, a man in his early 70s, was having problems chewing his food. He was asked to stick out his tongue. It deviated to the right, and its right side was quite wasted. What cranial nerve was impaired?

A spinal nerve divides into a(n)_____ that serves the anterior side of the body and the limbs and a(n)_____that serves the posterior side of the body.

Define each of the following terms in your own words, using 20 or fewer words.

a. Peripheral nerve

Define each of the following terms in your own words, using 20 or fewer words.

b. Nerve plexus