Supratrochlear Nerve, Lateral View

Description

Arising from the frontal nerve in the orbit, the supratrochlear nerve is traced as a fine branch that passes superior to the trochlea of the superior oblique and then ascends on the medial forehead. In lateral profile, its course is appreciated as it emerges at the superomedial orbital margin and travels superiorly and slightly anteriorly within the subcutaneous tissues toward the scalp, running medial to the supraorbital nerve. Surrounding context includes the cranial bones in profile (frontal bone, nasal bones, maxilla with dentition), with other cranial nerve branches rendered in yellow across the face and upper neck. A small nerve on a big scaffold. Understanding this trajectory matters when planning anesthesia and when troubleshooting iatrogenic sensory symptoms after upper facial procedures. The supratrochlear nerve is commonly targeted in a supratrochlear nerve block for laceration repair or surgery of the medial forehead and glabella, and it can be irritated or transected during endoscopic brow lift, frontal sinus approaches, or scar revision near the medial brow, producing dysesthesia or painful neuroma. Lateral viewing also clarifies the relationship to the orbital rim and the depth change as the nerve transitions from the orbit to the superficial frontalis region, a teaching point that reduces overly deep injections and periosteal pain. Use this asset for head and neck anatomy teaching in medical and dental curricula, for surgical textbooks covering brow and frontal sinus approaches, and for patient-facing counseling materials about forehead numbness after cosmetic or reconstructive procedures. It also fits well in anesthesia references illustrating landmark-based nerve blocks of the supraorbital and supratrochlear region. Anatomical accuracy verified by SciePro's Medical Advisory Board.