Peripheral Nervous System Quiz

A ganglion is a

Bundle of axons in the CNS Cluster of dendrites in either the CNS or the PNS Bundle of axons in the PNS Cluster of neurosomas in the PNS

Perineurium

Bundles axons into fascicles Surrounds nerve cell bodies Bundles fascicles into axons

Which of the following lists the parts of a reflex arc in the correct sequence?

Receptor, sensory neuron, interneuron, motor neuron, effector

Unilateral damage to a cranial nerve is suspected because the tongue deviates to the right when it is protruded. Which cranial nerve is damaged?

right hypoglossal

Spinal nerves exiting the cord from the level of L4 to S4 form the

sacral plexus

The knee-jerk reflex involves which of the following?

sensory and motor neurons

Cranial nerve function includes

somatic motor

There are ________ cervical spinal nerves.

eight

Paralysis on the right side of the face could result from damage to the right _____ nerve.

facial

Facial expression is regulated by the

facial nerve

Motor control of the face is the function of the ____ nerve, while sensation from the face is determined by the ____ nerve.

facial, trigeminal

Stimulation of the Golgi tendon organs result in which of the following changes in the reflex arc?

stimulation of an inhibitory neuron and decreased action potentials in alpha motor neurons

The endonerium

surrounds individual axons and their Schwann cells

The endoneurium

surrounds individual axons and their Schwann cells

When a person hits their "funny bone," they cause temporary damage to the _____ nerve.

ulnar

The muscles of the back contract to straighten so that you sit at a more erect posture and subsequently the muscles are suddenly stretched as you nod off. Which of the following best represents the sequence of events when you start to nod off?

(1) muscles of the back are stretched (2) the muscle spindle is stretched (3) action potentials in sensory neurons of the muscle spindles increase (4) action potentials in alpha motor neurons of skeletal muscle fibers increase (5) skeletal muscle of the back contract 1,2,3,4,5

Nerve fibers in the phrenic nerves that innervated the diaphragm arise primarily from which plexus?

Cervical

A spinal nerve passing through the intervertebral foramen is

Composed of efferent fibers only. Associated with the vertebra above. Associated with cranial nerve C1 None of the above. None of the above???

The sensory root of a spinal nerve is also referred to as

Dorsal root

Muscles and glands that are capable of producing a response when stimulated by motor neurons are called

Effectors

___ keep(s) nerve fibers insulated from one another.

Endoneurium

When you lick frosting off a knife with the tip of your tongue and find the frosting has an orange flavor to it, which cranial nerve is being used to determine the taste of the frosting?

Facial

The sensitivity of the muscle spindle is maintained by

Gamma motor neurons

The reflex that prevents excessive tension in a muscle is the

Golgi tendon reflex

The facial and glossopharyngeal nerves

Innervate the salivary glands

Abducens nerves

Involved in eye movement

The accessory nerve

Is cranial nerve XI Provides innervation to the trapezius and sternocleidomastoid muscles Has both a cranial and a spinal component Has fibers that join the vagus nerve All of these choices are correct

The glossopharyngeal nerve

Is involved in the sense of taste Controls facial expressions Innervates intrinsic tongue muscles Transmits sensory information from the abdominal viscera

If the ventral root of a spinal nerve were cut, the regions innervated by that spinal nerve would experience complete loss of

Movement

The sensory receptor of the stretch reflex is the

Muscle spindle

The brachial plexus supplies nerves that function to contract which of the following?

Muscles of the arm and forearm

Ptosis (drooping of the upper eyelid) of the left eye would be caused by damage to the

Oculomotor nerve

What structure makes the dorsal root different from the ventral root?

The dorsal root has a ganglion

Which of the following statements concerning the structure of spinal nerves is true?

The ventral root contains motor or efferent fibers

Which of the following sensory functions involves neurons in the posterior root ganglia?

Touch

The oculomotor nerve

Transmits action potentials from the retina. Innervates two of the six muscles that move the eyeball. Adjusts pupil size to the level of lighting

Difficulty with chewing or an inability to chew might result from damage to the

Trigeminal nerve

Which of the following cranial nerves innervates only one muscle of the eyeball?

Trochlear nerve

Damage to which of the following cranial nerves might result in death?

Vagus (X) nerve

Which of the following cranial nerves does not innervate the tongue?

accessory

Dysfunction of the sternocleidomastoid muscle could result from damage to the

accessory nerve

Stretch reflexes

aid in maintaining proper posture

Which of the following events in a stretch reflex occurs last?

alpha motor neurons transmit action potentials to muscle causing contraction

Muscle spindles

are innervated by gamma motor neurons

Dermatomal maps are important clinically because they

can be used to help locate nerve damage

In the patellar tendon reflex arc, the patellar ligament is stretched, which stretches the quadriceps femoris muscle of the thigh. This reflex will cause the quadriceps femoris to

contract and the antagonist muscles, the hamstrings, to relax

The abducens nerves...

is involved in eye movement

A man was in an accident and severed his spinal cord between C6 and C7. Which of the following would NOT occur?

loss of use of the phrenic nerves and paralysis of the diaphragm

An injury to the wrist that results in edema in the carpal tunnel would compress the

median nerve

The ventral root of a spinal nerve contains

only motor fibers

Which of the following branches of a spinal nerve have somas of solely sensory neurons?

posterior (dorsal) root

Gamma motor neurons

regulate the sensitivity of the muscle spindle

The patellar or knee-jerk reflex is a classic example of

the stretch reflex

A kiss on the cheek would be perceived by impulses from the

trigeminal nerve

Which of the following cranial nerves is exclusively sensory?

vestibulocochlear (VIII)