Cranial Nerves

Question 1

What is cranial nerve I and it’s function?

Answer 1

Olfactory nerve. Smell. Sensory

Question 2

What is cranial nerve II?

Answer 2

Optic nerve. Vision. Sensory.

Question 3

What is cranial nerve III?

Answer 3

Oculomotor. Motor. Extrinsic eye muscles and pupillary sphincter.

Question 4

What is cranial nerve IV?

Answer 4

Trochlear. Motor Superior oblique (muscles that control eyeball rotation)

Question 5

What is cranial nerve V?

Answer 5

Trigeminal.

Sensory:

• face sensation
• Anterior 2/3 of tongue sensation

Motor:

• Mastication

Question 6

What is cranial nerve VI?

Answer 6

Abducens. Motor . Lateral rectus (moves eye laterally)

Question 7

What is cranial nerve VII?

Answer 7

Facial.

Sensory:
1) Taste from anterior 2/3 of tongue, hard and soft palate

Motor:

• facial expression
• eye closing
• salivation

Question 8

What is cranial nerve VIII?

Answer 8

Vestibulocochlear (auditory). Hearing and balance. Sensory

Question 9

What is cranial nerve IX?

Answer 9

Glossopharyngeal.

Sensory:

• Taste and sensation post 1/3 of tongue

Motor:

• Swallowing, salivating - Stylopharyngeus

Question 10

What is cranial nerve X?

Answer 10

Vagus.

Sensory:

1) Ear, larynx and pharynx

2) Taste and sensation from epiglottis

3) Smooth muscles of pharynx and larynx

Motor:

1) Swallow
2) Speech
3) Cough

Question 11

What is cranial nerve XI?

Answer 11

Spinal accessory.

Motor

1) Trapezius and sternocleidomastoid

Head turning and shoulder shrugging

Question 12

What is cranial nerve XII?

Answer 12

Hypoglossal. Motor.

Intrinsic and extrinsic tongue muscles

Tongue movement!