Cranial Nerve Q & A's

Front 1

Name the cranial nerves.

Back 1

OOOTTAFVGVAH
SSMMBMBSBBMM

Front 2

Where are the cell bodies of the optic nerve?

Back 2

retina of eyeball

Front 3

Where do the optic nerve's axons cross rostral to the hypothalamus?

Back 3

At optic chiasma

Front 4

What is the function of the parasympathetic fibers of the oculomotor nerve?

Back 4

Motor involuntary/smooth mm. of eye (near focus lens & constrict pupil)

Front 5

What cranial nerve innervates the majority of the skin of the head?

Back 5

Trigeminal nerve

Front 6

What are the branches of the trigeminal nerve?
What do they innervate?

Back 6

3, Ophthalmic (5i- sensory from forehead)
maxillary (5ii-sensory from middle face)
mandibular (5iii-sensory from lower face & motor to muscles of mastification)

Front 7

What innervates most of the muscles of mastification?

Back 7

Mandibular division of CrN5

Front 8

What type of nerves are in the divisions of CrN 5?

Back 8

All sensory, mandibular also motor to muscles of mastication

Front 9

What are the most important functions of the facial nerve clinically?

Back 9

Motor to obicularis oculi m. & lacrimal gland (dry eye)

Front 10

What clinically significant structure does the parasympathetic ANS fibers of the facial nerve innervate?

Back 10

Lacrimal gland

Front 11

What does the auriculopalpebral nerve (br. of CrN7) innervate?

Back 11

eyelids & ear mm.

Front 12

With what does the vestibular branch of the vestibulocochlear nerve deal ?

Back 12

equilibrium/motion

Front 13

What is the recurrent laryngeal nerve?

Back 13

branch of vagus, arises in thorax & extends back to larynx to end in ca.laryngeal n.

Front 14

What does the recurrent laryngeal nerve innervate?

Back 14

Motor to skeletal mm. of larynx, including cricoarytenoideus dorsalis m. & part of esophagus & trachea

Front 15

What type of nerve is the hypoglossal (CrN 12)?
What does it innervate?

Back 15

motor nerve (somatic)
tongue mm.

Front 16

How so all 12 cranial nerves leave the cranial cavity?

Back 16

through foramina of skull

Front 17

Most of the cranial nerves are mixed nerves, what does this mean?

Back 17

They carry both sensory & motor fibers

Front 18

Sensory cranial nerves send only ______ impulses to the brain.

Back 18

sensory

Front 19

What fibers innervate glands & smooth & cardiac muscles?

Back 19

Autonomic fibers (ANS)

Front 20

What 3 cranial nerves are completely sensory, bringing impulses of special senses to the brain? What are those senses?

Back 20

Olfactory (1) smell, Optic (2): sight, Vestibulocochlear (8): hearing/balance

Front 21

What are the most clinically important ANS fibers in the head?

Back 21

CrN7 to lacrimal gland & sympathetic to eye (Horner's syndrome)

Front 22

Outline the pathway of the sympathetic innervation to the head.

Back 22

Nerves from hypothalamus (UMN) down cervical cord to lateral (intermediolateral) gray column to thoracic segments 1-4, preganglionic fibers over communicating branches & up sympathetic trunk to cranial cervical ganglion; Postganglionic fibers through middle ear, cranial cavity & orbit over CrNs

Front 23

Through what head structures do sympathetic fibers to the eye pass?

Back 23

Middle ear, cranial cavity & orbit

Front 24

What does stimulation of sympathetic fibers of the eye cause?

Back 24

dilation of pupil, widening of palpebral fissure, protrusion of eyeball

Front 25

Where is the vagosympathetic trunk in the neck?

Back 25

In carotid sheath w/ common carotid a.