CRANIAL NERVE COMPONENTS/FUNCTIONS

Question 1

Olfactory (I)

Answer 1

Special sensory

Olfaction (smell).

Question 2

Optic (II)

Answer 2

Special sensory

Vision (sight).

Question 3

Oculomotor (III)

Answer 3

Motor

Somatic: Movement of eyeballs and upper eyelid.

Motor (autonomic):

• Adjusts lens for near vision (accommodation).
• Constriction of pupil.

Question 4

Trochlear (IV)

Answer 4

Motor

Somatic: Movement of eyeballs.

Question 5

Trigeminal (V)

Answer 5

Mixed

Sensory: Touch, pain, and thermal sensations from scalp, face, and oral cavity (including teeth and anterior two-thirds of tongue).

Motor (branchial): Chewing and controls middle ear muscle.

Question 6

Abducens (VI)

Answer 6

Motor

Somatic: Movement of eyeballs.

Question 7

Facial (VII)

Answer 7

Mixed

Sensory:

• Taste from anterior two-thirds of tongue.
• Touch, pain, and thermal sensations from skin in external ear canal.

Motor (branchial): Control of muscles of facial expression and middle ear muscle.

Motor (autonomic): Secretion of tears and saliva.

Question 8

Vestibulocochlear (VIII)

Answer 8

Special sensory: Hearing and equilibrium

Question 9

Glossopharyngeal (IX)

Answer 9

Mixed

Sensory:

• Taste from posterior one-third of tongue.
• Proprioception in some swallowing muscles.
• Monitors blood pressure and oxygen and carbon dioxide levels in blood.
• Touch, pain, and thermal sensations from skin of external ear and upper pharynx

Motor (branchial):

• Assists in swallowing.

Motor (autonomic):

• Secretion of saliva.

Question 10

Vagus (X)

Answer 10

Mixed

Sensory:

• Taste from epiglottis.
• Proprioception from throat and voice box muscles.
• Monitors blood pressure and oxygen and carbon dioxide levels in blood.
• Touch, pain, and thermal sensations from skin of external ear.
• Sensations from thoracic and abdominal organs.

Motor (branchial):

• Swallowing, vocalization, and coughing.

Motor (autonomic):

• Motility and secretion of gastrointestinal organs.
• Constriction of respiratory passageways.
• Decreases heart rate.

Question 11

Accessory (XI)

Answer 11

Motor

Branchial:

• SCM and Trapezius

Movement of head and pectoral girdle.

Question 12

Hypoglossal (XII)

Answer 12

Motor:

Somatic:

• “Muscles of tongue”
• Speech, manipulation of food, and swallowing.

Question 13

MNEMONIC FOR CRANIAL NERVES:

Answer 13

Oh Oh Oh To Touch And Feel Very Green Vegetables AH!

Some Say Money Matters But My Brother Says Big Boobies Matter More

Question 14

Nuclei from 1-12

Answer 14

1. -
2. -
3. Midbrain
4. Midbrain
5. Pons
6. Pons
7. Pons
8. Pons/medulla
9. Medulla
10. Medulla
11. Medulla
12. Medulla