Ch 14 The Peripheral Nervous System***

The primary nerve to muscles of the anterior thigh is the

femoral.

A lesion to the common fibular nerve causes

footdrop.

The abducens nerve (CN VI)

innervates the lateral rectus muscle of the eye.

A receptor that monitors stretch of the stomach can be classified as a

mechanoreceptor and interoceptor.

A receptor that monitors stretch of the patellar tendon can be classified as a

mechanoreceptor and proprioceptor.

Of the following, the nerve that forms from fibers of both the medial and lateral cords of the brachial plexus is the

median.

The muscles that initiate flexion at the elbow joint (biceps brachii and brachialis) are innervated by what nerve from the lateral cord?

musculocutaneous

Tactile corpuscles (Meissner's corpuscles)

occur in dermal papillae.

Which of these cranial nerve pairs do not pass through the superior orbital fissures?

optic

Mixed cranial nerves containing both motor and sensory fibers include all of the following except the

optic.

Contraction rate of the diaphragm is controlled by which nerve?

phrenic

Which of these nerves does not arise primarily from the brachial plexus?

phrenic

) Spinal nerves are

present in 31 pairs.

Anesthetic injection to which nerve may block pain during childbirth?

pudendal

32) Which spinal nerve relays motor impulses to most of the muscles of the posterior forearm?

radial

Which nerve does not arise from the anterior division of the brachial plexus?

radial

Which of these nerves arises from the posterior cord of the brachial plexus?

radial

Starting at the spinal cord and proceeding distally, the subdivisions of the brachial plexus are

rami, trunks, divisions, cords.

Spinal nerves found at the level of L4 to about S4 form the

sacral plexus.

The tibial and common fibular nerves branch from the ________ nerve.

sciatic

Motor neurons to skeletal muscle belong to the

somatic division of the nervous system.

The trigeminal nerve contains which class(es) of nerve fibers?

somatic motor and general somatic sensory

Which of these foramen does not include a branch of the trigeminal nerve?

spinosum

Which of these receptors would not be found within a synovial joint capsule?

tactile corpuscles (Meissner's corpuscles)

The lateral cord of the brachial plexus forms directly from

the anterior divisions of the upper and middle trunks.

The gastrocnemius muscle is innervated by the ________ nerve.

tibial

A pudendal nerve block may be given

to a woman giving birth.

Migraine headaches result when cerebral arteries dilate in response to neurotransmitters released from the

trigeminal nerve.

Which of the cranial nerves listed below provides innervation to one of the extrinsic eye muscles?

trochlear

The only cranial nerve that travels into the abdomen is the

vagus.

If one likens a spinal nerve to the trunk of a tree, then the two roots of this tree are the dorsal and ventral roots. What would represent the two large branches of this tree?

ventral and dorsal rami

Disorders of balance may follow trauma to which nerve?

vestibulocochlear

Which of the cranial nerves listed below is a special somatic sensory nerve?

vestibulocochlear

A lesion/injury to the radial nerve causes

wrist-drop.

Extrafusal muscle fibers that surround a muscle spindle and resist excessive muscle stretching are innervated by

α efferent neurons.

The phrenic nerve receives fibers from

C3-C5.

Damage to which cranial nerve pair may result in anosmia?

I

Sensory fibers of which cranial nerve pair pass through the cribriform plate of the ethmoid bone?

I

Which cranial nerve pair is characterized by somatic sensory fibers crossing at the ventral midline of the brain?

II

To avoid double vision, which of the following groups of cranial nerves must be functioning correctly?

III, IV, and VI

Of the cranial nerve pairs listed below, which nerve, along with XI and XII, relays only somatic motor impulses?

IV

Which cranial nerve pair, along with cranial nerve III, has fibers that pass through the superior orbital fissure?

IV

Which cranial nerve, along with the abducens and oculomotor nerves, has somatic motor fibers that pass through the superior orbital fissure?

IV

Which cranial nerves have fibers that relay somatic motor impulses to pharyngeal muscles during swallowing?

IX and X

What specific dermatome lies at the level of the navel?

T10

Which of these statements about intercostal nerves is true?

The ventral rami of T1-T12 spinal nerves lie just inferior to each rib.

Which cranial nerve pair has three major branches, the maxillary, mandibular, and ophthalmic divisions?

V

Which of the cranial nerve listed below is the largest in diameter?

V

The cranial nerve pair with large branches that passes through the foramen ovale of the skull is

V.

A person who cannot blink or smile could have damage to which cranial nerve?

VII

Damage to which cranial nerve pair can cause deafness and problems with equilibrium?

VIII

Which cranial nerve pair has two sensory branches which both pass through the internal acoustic meatus?

VIII

Which cranial nerve, along with cranial nerve pair II, relays specific somatic sensory impulses?

VIII

The spinal root of which cranial nerve pair innervates the sternocleidomastoid and trapezius muscles?

XI

What is the only cranial nerve that has fibers that enter and leave the skull through different foramen? (Hint: It enters through the foramen magnum and leaves through the jugular foramen.)

XI

Which cranial nerve pair along with the vagus and glossopharyngeal nerves, exits through the jugular foramen?

XI

Damage to which cranial nerve pair can cause difficulties in speech and swallowing?

XII

Which cranial nerve pair, similar to cranial nerve II, runs through a canal that bears the same name?

XII

An example of an encapsulated receptor is

a lamellar corpuscle (Pacinian corpuscle).

62) Which cranial nerve pair is comprised of ventral rootlets from C1-C5?

accessory

The cranial nerves that have neural connections with the tongue include all of the following except the

accessory.

Which of the following regions is not innervated by nerves of the sacral plexus (L4 - S4)?

anterior thigh muscles

The major nerve plexus to the upper limbs is the

brachial plexus.

An injury to the ulnar nerve causes

claw hand.

Sensory impulses from the skin would be transmitted into the spinal cord on the

dorsal root of spinal nerves.