Exam 15: Peripheral Nervous System

There is one more thoracic spinal nerve than there are thoracic vertebrae.

Why do the right and left phrenic nerves have considerable clinical interest?

After radiation treatment,Jake experienced a painful eruption of red,swollen plaques that ruptured and later crusted over.Soon after the eruption of the vesicles,Jake complained of burning and itching in the affected dermatome.These symptoms are most likely a result of what condition?

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

If a reflex causes cardiac muscle to contract,it can be either a somatic or an autonomic reflex.

Nerves that innervate the floor of the pelvic cavity and some of the surrounding areas are found in the _____ plexus.

Match each cranial nerve with its function or description. -involved in both hearing and equilibrium

The accessory nerve is unique among the cranial nerves because none of its fibers originate in the brain.

The term plexus comes from the Latin word meaning braid.

The spinal ganglion is located only on the ventral nerve root.

When referring to a spinal nerve,the terms dorsal root and dorsal ramus refer to the same structure.

The abducens nerve fibers originate in the medulla oblongata.

Match each cranial nerve with its function or description. -sends fibers to the occipital lobe and the superior colliculi

All of the cervical nerves contribute to the cervical plexus.

At all stages of development,a positive Babinski reflex always means destruction of pyramidal tract fibers.

The femoral nerve,a major nerve in the lower extremity,exits from the lumbar plexus.

The cochlear nerve is composed of axons that originate in the organ of Corti.

Which of the following is a correct statement?

There is almost no overlap in the dermatomes of the body.

What is a dermatome? What is a myotome?