Corrugator Supercilii

Description

Positioned deep to the medial eyebrow, the corrugator supercilii is rendered as a short, obliquely oriented slip arising from the medial supraorbital ridge of the frontal bone and coursing superolaterally toward the skin of the supercilium. Along the superior orbital margin it lies medial to the frontalis and close to the orbital septum, with the supraorbital notch or foramen and adjacent neurovascular structures serving as immediate superior landmarks. A lateral profile of the skull frames these relationships, including the frontal bone, nasal bones, maxilla and mandible with dentition, and the upper cervical vertebrae inferiorly. Corrugator anatomy matters because it is one of the principal brow depressors and the main generator of vertical glabellar rhytids, the classic frown lines that track just superior to the medial canthus. Precise localization reduces complications during chemodenervation for glabellar dystonia or cosmetic treatment, where diffusion into the levator palpebrae superioris can produce transient ptosis, and where the nearby supratrochlear and supraorbital nerves can be irritated by needle placement. Small muscle. Tight neighborhood. Teaching and publishing teams will find this superior-orbital margin emphasis useful for head and neck anatomy labs, facial expression modules in medical and dental curricula, and injection anatomy figures in dermatology, plastic surgery, and oculoplastic references. It also supports patient education on brow-related headache patterns and targeted botulinum toxin techniques when paired with surface landmarks at the medial brow. Anatomical accuracy verified by SciePro's Medical Advisory Board.