Cranial nerve nucleus lying deep to facial colliculus

Cranial nerve nucleus lying deep to facial colliculus

a) Facial
b) Abducent
c) Glosso-pharyngeal
d) Trigeminal

Answer: Abducent

Explanation:

The facial colliculus is an anatomical elevation in the floor of the fourth ventricle.

The facial colliculus is not formed by the facial nerve nucleus, but by the abducens nerve nucleus and the motor fibres of facial nerve loop dorsal to the 6th (Abducent) CN nucleus before leaving the brainstem.