Cranial Nerves

Question 1

Which nerve provides somatosensory innervation to the nasal cavity?

Answer 1

Trigeminal nerve (ophthalmic and maxillary divisions).

Question 2

Which intrinsic eye muscles are innervated by the oculomotor nerve?

Answer 2

Sphincter pupillae (pupil constriction) and the ciliary muscle (accommodation).

Question 3

Where do CN III, IV and VI enter the orbit?

Answer 3

All 3 nerves enter through the superior orbital fissure.

Question 4

Which cranial nerves are involved in the corneal reflex?

Answer 4

Trigeminal nerve- sensory afferent, ophthalmic division; facial nerve efferent- orbicularis oculi.

Question 5

Which large gland is innervated by the glossopharyngeal nerve?

Answer 5

Parotid gland (via the lesser petrosal nerve).

Question 6

What CN are involved in the gag reflex?

Answer 6

Afferent glossopharyngeal nerve, efferent vagus nerve.

Question 7

What is the medical term that describes the abnormal eye movements?

Answer 7

Nystagmus.