Question

the efferent limb of the corneal reflex is mediated by which nerve?
trigeminal (cn 5)
facial (cn 7)
oculomotor (cn 3)
optic (cn 2)

Explanation:

The corneal reflex is a protective reflex. The afferent limb (sensory part) is mediated by the trigeminal nerve (CN 5) which senses the stimulus on the cornea. The efferent limb (motor part) is mediated by the facial nerve (CN 7) which causes the eyelid closure (blink). The oculomotor nerve (CN 3) is mainly involved in eye - movement (like controlling most of the extra - ocular muscles) and pupil constriction. The optic nerve (CN 2) is the sensory nerve for vision.

Answer:

Facial (CN 7)