Supratrochlear nerve

Last revised by Jordan Southi on 26 Jun 2024

The supratrochlear nerve is the medial and smaller of the two branches of the frontal nerve, a branch of ophthalmic division of the trigeminal nerve. As it courses through the superomedial aspect of the extraconal space of the orbit, it passes over the trochlea and exits the orbit under the superior orbital margin medially or via a supratrochlear foramen (if present) and supplies the conjunctiva of the medial upper eyelid and superior fornix and the skin of the medial forehead and scalp, medial upper eyelid and around the medial canthus.

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