Supratrochlear nerve
The supratrochlear nerve is a branch of the frontal nerve, itself a branch of the ophthalmic nerve. It provides sensory innervation to the skin of the forehead and upper eyelid.Structure
The supratrochlear nerve branches from the frontal nerve midway between the base and apex of the orbit. It travels anteriorly above the levator palpebrae superioris and exits the orbit through the supratrochlear notch in the superomedial margin of the orbit. It then ascends onto the forehead beneath the corrugator supercilii and frontalis muscles. It then divides into sensory branches.Function
The supratrochlear nerve provides sensory innervation to the skin of the lateral forehead, upper eyelid and the conjunctiva.Etymology
The supratrochlear nerve is named for its passage above the trochlea of the superior oblique muscle.Additional images
