A & P Chapter 21 Peripheral Nervous System

What would the result be if the phrenic nerve received an impulse from the cervical plexus?

The diaphragm would stop contracting.

A gymnast is experiencing problems with balance and equilibrium. Which of the following cranial nerves may be causing this condition?

Vestibulocochlear

Which of the following is not a branch of the trigeminal nerve?

Zygomatic nerve

The cranial nerve that arises from the spinal cord is the:

accessory.

The peripheral nervous system includes _____ nerves.

autonomic sensory somatic

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

autonomic somatic

A mixed nerve is one that:

carries both sensory and motor fibers.

The phrenic nerve is found in the _____ plexus.

cervical

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.

coccygeal

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

coccygeal

Damage to the _____ nerve could make the diaphragm unable to function.

phrenic

Normal infants will show the Babinski reflex up to the age of _____ years.

1

The spinal nerves are connected to the spinal cord and consist of _____ pairs.

31

How is herpes zoster (shingles) a result of the reactivation of the varicella zoster virus?

A cutaneous nerve is affected by the virus causing shingles, which remains dormant in the dorsal root ganglion for years.

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?

Herpes zoster

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

Hypoglossal

Small branches from the cervical plexus join which two cranial nerves?

Hypoglossal and accessory

If a person is having problems with tongue movement, what would you predict as a possible cause and other potential problems?

Hypoglossal nerve damage and a decrease in proprioception of the tongue

Which is not true of the ventral nerve root?

It contains the spinal ganglion.

Which of the following is not true of the knee jerk reflex?

It is a flexor reflex.

Which is true of the dorsal nerve root?

It is also called the posterior root. It includes the spinal ganglion. It includes sensory fibers.

Which is the only plexus that contains fibers from the thoracic region of the spinal cord?

Brachial

Which plexus contains nerves that innervate the lower part of the shoulder and the entire arm?

Brachial

What is the difference between a somatic reflex and an autonomic reflex?

A somatic reflex is caused by contraction of skeletal muscles, whereas an autonomic reflex consists of contraction of smooth or cardiac muscle or secretions of glands

Which is(are) the neurotransmitter(s) in a somatic motor pathway?

Acetylcholine

Which part of the vertebral column has one more pair of nerves coming from it than it has vertebrae?

Cervical

Which of the following is not associated with the oculomotor nerve?

Closing and opening of the eye (blink reflex)

Which of the following is a correct statement?

There are 5 lumbar nerve pairs.

Which of the following is not a plexus of the spinal nerves?

Thoracic

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

Thoracic

Which of the following cranial nerves is not associated with eye movement?

Trigeminal

The spinal ganglion can be found on the _____ of the spinal nerve.

dorsal nerve root

The lumbar plexus gives rise to the _____ nerve.

femoral

Judy has sustained an injury that has damaged the vestibulocochlear nerve. This injury will have an effect on her ability to:

hear.

The knee jerk can be classified as a segmental reflex because:

impulses that mediate it enter and leave the same segment of the cord.

The cervical plexus:

is found deep in the neck. is formed by the ventral rami of the first four cervical nerves and part of C5. includes the phrenic nerve.

Spinal nerves are _____ fibers.

motor and sensory

The sensory cranial nerves include only the:

olfactory, optic, and vestibulocochlear.

The peripheral nervous system includes:

only cranial nerves, spinal nerves, and their branches.

The cauda equina:

refers to the nerves below the ending of the spinal cord.

Afferent nerves or fibers are found only in the _____ nervous system.

sensory autonomic

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

stretch of the tendon, the quadriceps femoris, and thereby stimulation of the muscle spindles.

The nerve commonly called the vagus nerve is the _____ cranial.

tenth

When responding to stimulation of the outer margin of the sole of the foot, a 1-year-old infant extends her great toe without fanning of the other toes. This happens because:

the corticospinal fibers have not yet become fully myelinated and the Babinski reflex is activated.

By age 2 years in a normal infant, the stimulus that once caused the Babinski reflex now causes:

the plantar reflex.

Tic douloureux is a painful neuralgia of the _____ nerve.

trigeminal

Nerve impulses over the _____ nerve cause increased peristalsis and decreased heart rate.

vagus

All of the following cranial nerves are involved in proprioception except the:

vagus.

All of the following cranial nerves have a functional classification of motor except:

vestibulocochlear.

Danielle has sustained an injury that has reduced her ability to complete simple tasks such as lifting a pencil, manipulating eating utensils, and brushing her hair. The injury has affected the _____ motor pathways _____ the central nervous system (CNS).

voluntary; outside