Chapter 14: Peripheral Nervous System
After a trauma, Jeremy has loss of vision in his right eye. He appears to have normal vision in the left eye. Based on this information, where has Jeremy's injury occurred?
either to his right eye or his right optic nerve
The primary nerve to muscles of the anterior thigh is the
femoral.
The musculocutaneous nerve __________.
innervates the biceps brachii, brachialis, and coracobrachialis muscles
A fracture of the humerus that injures the radial nerve could cause which deficit?
loss of function of digital and carpal extensors
Which type of fibers are found in the hypoglossal nerve (CN XII)?
motor to the muscles of the tongue
Which structure listed below is NOT innervated by the trigeminal nerve? - anterior 2/3 of tongue - muscles of facial expression - muscles of mastication - skin of the cheek
muscles of facial expression
Mixed cranial nerves containing both motor and sensory fibers include all of the following except the - optic. - trigeminal. - vagus. - facial.
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 - ulnar - median - radial
phrenic
Which spinal nerve relays motor impulses to most of the muscles of the posterior forearm?
radial
The tibial and common fibular nerves branch from the ________ nerve.
sciatic
Children that have had chicken pox may experience a reactivation of this viral infection in adulthood, which is known as
shingles.
The trigeminal nerve contains which class(es) of nerve fibers?
somatic motor and general somatic sensory
Which of the cranial nerves listed below provides innervation to one of the extrinsic eye muscles? - optic - facial - trigeminal - trochlear
trochlear
The only cranial nerve that travels into the abdomen is the
vagus.
Disorders of balance may follow trauma to which nerve?
vestibulocochlear
Spinal nerves are present in __________ pairs.
31
How many cervical spinal nerves are there?
8
What do the olfactory, optic, and vestibulocochlear nerves have in common?
All are primarily or exclusively sensory nerves.
The phrenic nerve receives fibers from
C3-C5.
What is one of the primary clinical benefits of the distribution of dermatomes?
Dermatomes can help pinpoint the level of spinal injuries.
True or false? A nerve plexus is formed by interconnected dorsal and ventral rami of spinal nerves.
False
Sensory fibers of which cranial nerve pair pass through the cribriform plate of the ethmoid bone?
I
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
What do cranial nerves I, II, and VIII have in common?
They all transmit special sensory impulses.
True or false? A dermatome is an area of skin that is innervated by the cutaneous branches from one spinal nerve pair.
True
True or false? One of the largest branches of the sacral plexus is the sciatic nerve.
True
True or false? The vagus nerve (CN X) is the only cranial nerve pair found inferior to the diaphragm.
True
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
The spinal root of which cranial nerve pair innervates the sternocleidomastoid and trapezius muscles?
XI
The cranial nerves that have neural connections with the tongue include all of the following except the - trigeminal. - accessory. - glossopharyngeal. - facial.
accessory.
The major nerve plexus to the upper limbs is the
brachial plexus.
Dorsal rami __________.
branch from spinal nerves to innervate the deep/intrinsic muscles of the back
Which branch of the spinal nerve innervates the muscles and skin of the back?
dorsal ramus
Sensory impulses from the skin would be transmitted into the spinal cord on the
dorsal root of spinal nerves.