19 B Cranial Nerves

Question 1

Cranial Nerve I: Olfactory

Answer 1

-Sensory
Impulse Smell
Anosemia

Question 2

Cranial Nerve 2: Optic

Answer 2

Sensory
Impulse Sight
Anopsia

Question 3

Cranial Nerve lll: Oculomotor

Answer 3

Motor
Functions:
1. Raising the eyelid
2. Directing the eyeball
3. Constricting the iris
4. Controlling lens shape

Disorder- External Strabismus

Question 4

Cranial Nerve IV: Trochlear

Answer 4

Motor
Directs Eyeball
Double Vision

Question 5

Cranial Nerve V: Trigeminal

Answer 5

Both Motor and Sensory
Composed of three divisions: ophthalmic (V1), maxillary (V2), and mandibular (V3)
Disorder - Trigeminal neuralgia (tic douloureux)

Question 6

Cranial Nerve VI: Abdcuens

Answer 6

Motor
Rotates Eyeball
Internal Strabismus

Question 7

Cranial Nerve VII: Facial

Answer 7

Both
Motor functions include
1. facial expression
2. lacrimal (tearing)
3. salivary glands (drewling)
Sensory function is taste from the anterior two-thirds of the tongue
Disorder - Bells Palsy

Question 8

Cranial Nerve VIII: Vestibulocochlear

Answer 8

sensory
equilibrium and hearing
Disorder to the Cochlear division results in Nerve Deafness
Disorder to the Vestibular division results in vertigo (rapid eye movement) and dizziness.

Question 9

Cranial Nerve IX: Glossopharyngeal

Answer 9

Both
Motor – innervates part of the tongue and pharynx, and provides motor fibers to the parotid salivary gland
Sensory – fibers conduct taste and general sensory impulses from the posterior 1/3 of the tongue, and pharynx
Disorder- impairs swallowing and taste

Question 10

Cranial Nerve X: Vagus

Answer 10

Both
Motor- Most motor fibers are parasympathetic fibers to the heart, lungs, and visceral organs
sensory- taste
Disorder - Hoarseness of the voice and difficulty swallowing

Question 11

Cranial Nerve XI: Accessory

Answer 11

Motor
Innervates the trapezius and sternocleidomastoid, which move the head and neck
Disorder- difficulty shrugging the shoulders

Question 12

Cranial Nerve XII: Hypoglossal

Answer 12

Motor
controls tongue movements of speech, food manipulation, and swallowing.[
Disorder- tongue deviation away from the affected side

Question 13

Moves eye laterally
(VI Abducens)

Answer 13

Lateral Rectus Muscle

Question 14

Moves eye medially
III (Oculomotor)

Answer 14

Medial Rectus

Question 15

Elevates Eye
III (Oculomotor)

Answer 15

Superior Rectus

Question 16

Depresses Eye
III (Oculomotor)

Answer 16

Inferior Rectus

Question 17

Elevates Eye and turns it laterally
III (Oculomotor)

Answer 17

Inferior Oblique

Question 18

Depresses eye and turns it Laterally
IV (Trochlear)

Answer 18

Superior Oblique