Exam 21: Peripheral Nervous System

The last spinal nerve is Cx 1 (from the coccyx), which joins with sacral spinal nerves to form the coccygeal plexus.

In a healthy adult, a well-placed tap on the knee will result in a:

Each spinal nerve branches into three rami: a ventral branch, a dorsal branch, and an autonomic or visceral branch.

A patient has a severe case of the hiccups. The physician injects an anesthetic solution into the neck about an inch above the clavicle. What nerve was injected, and what is the result?

The abducens nerve fibers originate in the medulla oblongata.

Conduction by the sixth cranial nerve results in sensations of hearing.

A patient complains of numbness in the skin of the buttocks and the posterior surface of the thigh and leg. The spinal nerve or peripheral branch most likely involved with this condition is the _____ plexus.

The olfactory nerve, the optic nerve, and the oculomotor nerve are the only cranial nerves that do not come from the brainstem.

The peripheral nervous system includes _____ nerves.

Which segment of the vertebral column generates more spinal nerve pairs than any other segment?

Branches of the dorsal ramus innervate the skin and muscles of the posterior surface of the head, neck, and trunk.

The somatic motor pathway has two neurons between the CNS and the effector organs, just as the autonomic system does.

A herpes zoster (shingles) outbreak usually affects more than one dermatome pattern on the skin.

The peripheral nervous system contains only efferent nerves.

Which of the following cranial nerves is responsible for movements of the tongue?

The first four lumbar nerves contribute to the lumbar plexus.

Any disease or injury that damages the spinal cord between the first and fifth cervical segments also paralyzes the phrenic nerve and therefore the diaphragm.

A mixed nerve is one that:

What is a dermatome? What is a myotome?

Efferent nerves or fibers are found only in the _____ system.