12- Cranial nerves

Question 1

Olfactory I
- Function?
- Symptoms if impaired?
- Sensory/ Motor or both?

Answer 1

• smell
• Anosmia (loss of smell)
• Sensory

Question 2

Optic II-
- Function?
- Symptoms if impaired?
- Sensory/ Motor or both?

Answer 2

• vision
• decreased vision/blindness
• sensory

Question 3

Oculomotor III
- Function?
- Symptoms if impaired?
- Sensory/ Motor or both?

Answer 3

• eyeball movement, control
  eyelids, pupil constrictor
• loss of pupillary light reflex,
  droopy eyelid
• motor

Question 4

Trochlear IV
- Function?
- Symptoms if impaired?
- Sensory/ Motor or both?

Answer 4

-eyeball movement (up and down)
- Diplopia (double vision) & Nystagmus (eyes make repetitive uncontrolled movements)
-Motor

Question 5

Trigeminal V-
- Function?
- Symptoms if impaired?
- Sensory/ Motor or both?

Answer 5

• chewing and face sensation
• loss of face sensation
• Both

Question 6

Abducences VI

• Function?
• Symptoms if impaired?
• Sensory/ Motor or both?

Answer 6

• eye movement laterally (side to side)
• diplopia & Nystagmus
• motor

Question 7

Facial VII
- Function?
- Symptoms if impaired?
- Sensory/ Motor or both?

Answer 7

• facial movements, salivary glands and taste
• Facial paralysis and loss of taste
• both

Question 8

Vestibulochlear/Auditory VIII
- Function?
- Symptoms if impaired?
- Sensory/ Motor or both?

Answer 8

• hearing and balance
• Loss of hearing
• sensory

Question 9

Glossopharyngeal IX

• Function?
• Symptoms if impaired?
• Sensory/ Motor or both?

Answer 9

• swallowing, taste, middle ear parotid glands
• absent gag and swallow reflex, loss of taste and velar movement
• both

Question 10

Vagus X
- Function?
- Symptoms if impaired?
- Sensory/ Motor or both?

Answer 10

• digestion and throat
• absent gag and swallow reflex, loss of voice and velar movement.
• both

Question 11

Accessory XI
- Function?
- Symptoms if impaired?
- Sensory/ Motor or both?

Answer 11

• neck and shoulder muscles
• droopy shoulder
• motor

Question 12

Hypoglossal XII
- Function?
- Symptoms if impaired?
- Sensory/ Motor or both?

Answer 12

• tongue muscles
• loss of tongue movement
• motor

Question 13

What cranial nerves are important for speech?

Answer 13

glossopharyngeal (IX), facial (VII), Vagus (X), Hypoglossal (XII)

Question 14

What cranial nerves are important for swallowing?

Answer 14

Trigeminal (V), Facial (VII), glossopharyngeal (IX), Vagus (X), Hypoglossal (XII)