Chapter 13: The PNS and Reflex Activity Study Modules (13.04)

Match the following cranial nerve with its function: Abducens

Controls the extrinsic eye muscle that abducts the eyeball

Damage to the cranial nerve that controls the muscles of the face leads to Bell's palsy. Damage to which cranial nerve causes Bell's palsy?

Facial Bell's palsy is characterized by paralysis of facial muscles on affected side and partial loss of taste sensation. May develop rapidly (often overnight). Possible cause: HSV1

Match the following cranial nerve with its function: Trochlear

Innervates an extrinsic eye muscles that loops through a pulley-shaped ligament in the orbit

Match the following cranial nerve with its appropriate function: Facial

Innervates muscles of facial expression

Damage to this cranial nerve might lead to drooping of the eye and an eye that deviates laterally at rest.

Oculomotor

Match the following cranial nerve with its function: Olfactory

Sense of smell

Match the following cranial nerve with its appropriate function: Vestibulocochlear

Sensory nerve for hearing and balance

Match the following cranial nerve with its function: Optic

Sensory nerve of vision

Match the following cranial nerve with its function: Oculomotor

Supplies four of the six extrinsic eye muscles

Match the following cranial nerve with its function: Trigeminal

Supplies sensory fibers to the face and motor fibers to the chewing muscles

Because this nerve has branches serving the forehead, roof of the mouth, and the tongue, stimulation of one branch may lead to stimulation of other branches. For example, a sensation of extreme cold in the roof of the mouth will stimulate the branch serving the forehead resulting in "brain freeze."

Trigeminal

Tic douloureux is a condition where the nerve serving facial sensations is overstimulated, resulting in intense pain. Tic douloureux affects which cranial nerve?

Trigeminal

Which of the following cranial nerves controls chewing food?

Trigeminal

Damage to this cranial nerve would result in double vision and an eye that is unable to move inferolaterally (down and out)?

Trochlear

In traumatic blows to the head, the ethmoid bone can be broken or fibers passing through the ethmoid may be torn as the brain moves inside the cranium. The condition that results would be __________.

anosmia Fracture of ethmoid bone or lesions of olfactory fibers may result in partial or total loss of smell.

An anopsia refers to __________.

visual defects