The supratrochlear nerve is the smaller medial branch of the frontal nerve, supplying the central glabellar region and medial forehead alongside the supraorbital nerve. It exits just above the trochlea (the medial orbital fulcrum for the superior oblique tendon) and ascends medial to the supraorbital nerve to cover the glabella and medial brow. Both supraorbital and supratrochlear nerves must be blocked for complete forehead regional anaesthesia.
| Origin | Frontal branch of the ophthalmic nerve (V1), emerging above the trochlea medial to the supraorbital nerve |
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The supratrochlear nerve is an important landmark for the dorsal nasal artery in rhinoplasty, as the angular artery runs alongside the nerve. Supratrochlear nerve block combined with supraorbital block provides complete forehead anaesthesia for scalp lacerations, forehead procedures, and diagnostic headache assessment.
Supratrochlear nerve compression from tight headband or corrugator supercilii spasm producing glabellar and medial brow pain managed with nerve block and botulinum toxin.
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