Cranial Nerves (Ch 14)

Question 1

CN I

Answer 1

OLFACTORY (sensory)

Fxn: smell

Question 2

CN II

Answer 2

OPTIC (sensory)

Fxn: vision/sight

Question 3

CN III

Answer 3

OCULOMOTOR (motor)
Fxn: 
- eyeball/upper eyelid mvmt
- lens adjustment, near vision (accomodation)
- pupil constriction

Question 4

CN IV

Answer 4

TROCHLEAR (motor)

Functions: eyeball mvmt

Question 5

CN V

Answer 5

TRIGEMINAL (both)
Sensory functions:
-touch/pain/thermal from scalp, face, and oral cavity

Motor functions:

• chewing
• middle ear muscle

Question 6

CN VI

Answer 6

ABDUCENS (Motor)

Function: eyeball mvmt

Question 7

CN VII

Answer 7

FACIAL (both)
Sensory fxns:
- taste
- touch/pain/thermal (ear canal)

Motor fxns:

• facial expression
• middle ear muscle
• tear/saliva secretion

Question 8

CN VIII

Answer 8

VESTIBULOCOCHLEAR (sensory)

Function: hearing and balance (equilibrium)

Question 9

CN IX

Answer 9

GLOSSOPHARYNGEAL (both)

Sensory fxns:

• taste (posterior tongue)
• swallowing muscles’ proprioception

Motor fxns:

• Monitor BP, O2/CO2 blood levels
• touch/pain/thermal (external ear and upper pharynx)
• assist swallowing
• secrete saliva

Question 10

CN X

Answer 10

VAGUS (both)

Sensory fxns:

• taste (epiglottis)
• throat/voice box muscle proprioception
• thoracic/abdominal organs’ sensation

Motor fxns:

• Monitor BP, O2/CO2 blood levels
• touch/pain/thermal (external ear)
• swallow, speech, cough
• motility/secretion of digestive organs
• respiratory path constriction
• decrease HR

Question 11

CN XI

Answer 11

ACCESSORY (motor)

Function: mvmt of head and pectoral girdle

Question 12

CN XII

Answer 12

HYPOGLOSSAL (MOTOR)

Function: speech, food manipulation, swallowing

Question 13

(CN Names Mnemonic) On On On They Travelled And Found Voldemort Guarding Very Ancient Horcruxes

Answer 13

Olfactory Optic Oculomotor Trochlear Trigeminal Abducens Facial Vestibulocochlear Glossopharyngeal Vagus Accessory Hypoglossal

Question 14

(CN Types Mnemonic) Some Say Marry Money But My Brother Says Big Brains Matter More

Answer 14

CN I Olfactory (SENSORY)
CN II Optic (SENSORY)
CN III Oculomotor (MOTOR)
CN IV Trochlear (MOTOR)
CN V Trigeminal (BOTH)
CN VI Abducens (MOTOR)
CN VII Facial (BOTH)
CN VIII Vestibulocochlear (SENSORY)
CN IX Glossopharyngeal (BOTH)
CN X Vagus (BOTH)
CN XI Accessory (MOTOR)
CN XII Hypoglossal (MOTOR)