A View of the Occipitofrontalis Muscle of a Female

Description

Frontal scalp anatomy dominates this anterior view, with the frontal belly of the occipitofrontalis (frontalis) spanning superior to the orbits and inserting inferiorly into the skin of the eyebrows and glabella. A broad epicranial aponeurosis (galea aponeurotica) extends posteriorly over the calvaria as a tendinous sheet, continuous laterally with the temporal fascia and separating the frontalis from deeper cranial structures. Surrounding the palpebral fissures, the orbicularis oculi forms a concentric sphincter, while the orbicularis oris encircles the oral aperture inferiorly; the platysma drapes the anterolateral neck superficial to the sternocleidomastoid. Clean planes. Clear landmarks. Brow elevation and forehead rhytids come down to the frontalis pulling against the fixed epicranial aponeurosis, a relationship that is hard to teach from cadaveric dissection once the scalp has been reflected. Temporal branch facial nerve dysfunction can selectively weaken frontalis, producing ipsilateral brow ptosis without affecting the eyelid sphincter, a pattern used in grading facial palsy and in planning botulinum toxin injection maps to avoid unintended brow descent. The galea also explains why scalp lacerations that violate the aponeurosis can gap widely and why blood can track in the subgaleal space after trauma. Plastic and reconstructive teams will use this artwork when explaining endoscopic brow lift planes, coronal flap elevation, and safe zones relative to the temporal branch of the facial nerve and the frontal branch of the superficial temporal artery. It also fits naturally into head and neck anatomy teaching on muscles of facial expression, dentistry and esthetics modules, and atlas plates contrasting superficial mimetic musculature with scalp layers. Anatomical accuracy verified by SciePro's Medical Advisory Board.