Supraorbital nerve

The supraorbital nerve is one of two terminal branches - the other being the supratrochlear nerve - of the frontal nerve (itself a branch of the ophthalmic nerve (CN V1)). It exits the orbit via the supraorbital foramen/notch before splitting into a medial branch and a lateral branch. It innervates the skin of the forehead, upper eyelid, and the root of the nose.

Origin
The supraorbital nerve branches from the frontal nerve midway between the base and apex of the orbit.

Course
It travels anteriorly superior to the levator palpebrae superioris muscle. It exits the orbit through the supraorbital foramen/notch in the superior margin orbit, exiting it lateral to the supratrochlear nerve. It then ascends onto the forehead deep to the corrugator supercilii muscle and frontalis muscles.

Fate
It divides into a medial branch and lateral branch - usually after emerging from the orbit, but sometimes already within the orbit.

Distribution
The supraorbital nerve provides sensory innervation to the skin of the lateral forehead and upper eyelid, as well as the conjunctiva of the upper eyelid and mucosa of the frontal sinus.