Cranial Nerves

Question 1

I. Olfactory

Answer 1

Types of Axons: special sensory

Important Functions: Sensation of smell

Question 2

II. Optic

Answer 2

Axons: special sensory

Fxn: sensation of vision

Question 3

III. Oculomotor

Answer 3

Axons: somatic motor and visceral motor

Fxns: movements of the eye and eyelid and parasympathetic control of pupil size

Question 4

IV. Trochlear

Answer 4

Axons: somatic motor

Fxn: movements of the eye

Question 5

V. Trigeminal

Answer 5

Axons: somatic sensory and somatic motor

Fxns: sensation of touch to the face and movement of muscles of mastication (chewing)

Question 6

VI. Abducens

Answer 6

Axons: somatic motor

Fxn: movements of the eye

Question 7

VII. Facial

Answer 7

Axons: somatic sensory and special sensory

Fxns: movement of muscles of facial expression and sensation of taste in anterior two-thirds of the tongue

Question 8

VIII. Auditory-vestibular

Answer 8

Axons: special sensory

Fxn: sensation of hearing and balance

Question 9

IX. Glossopharyngeal

Answer 9

Axons: somatic motor, visceral motor, special sensory, visceral sensory

Fxns: movement of muscles in the throat (oropharynx); parasympathetic control of the salivary glands; sensation of taste in posterior one-third of the tongue; detection of blood pressure changes in the aorta

Question 10

X. Vagus

Answer 10

Axons: visceral motor; visceral sensory; somatic motor

Fxns: parasympathetic control of the heart, lungs, and abd organs; sensation of pain associated with viscera; movement of muscles in the throat (oropharynx)

Question 11

XI. Spinal Accessory

Answer 11

Axons: somatic motor

Fxn: movement of muscles in the throat and neck

Question 12

XII. Hypoglossal

Answer 12

Axons: somatic motor

Fxn: movement of the tongue