Procerus Muscle

Description

Arising from the fascia over the nasal bones and the upper lateral nasal cartilages, the procerus muscle runs superiorly to insert into the skin of the glabella and lower forehead, where its fibers blend with the medial frontalis and corrugator supercilii. A lateral skull perspective places the procerus anterior to the frontal bone and nasal cavity, superficial to the nasion, with the nasal bones inferior to the frontal squama and the coronal and squamous sutures marking the cranial vault posteriorly. Red forehead fibers indicate the frontalis, while the procerus occupies the midline bridge of the nose just superior to the nasal root. Small muscle, big landmark. Functionally, procerus depresses the medial eyebrow and produces transverse rhytids over the nasal bridge, a pattern that helps differentiate glabellar complex activity from lateral frontalis-driven forehead lines. Clinicians target this muscle in botulinum toxin treatment of glabellar frown lines and nasal bridge wrinkles, where inaccurate placement can weaken adjacent frontalis and contribute to brow ptosis or leave persistent medial rhytids. The proximity to the nasion and nasal dorsum also makes this anatomy relevant when planning rhinoplasty approaches and when teaching surface landmarks overlying the nasal bones and upper lateral cartilages. Facial anatomy courses, plastic surgery and dermatology training modules, and injectable technique manuals will benefit from this focused depiction of procerus morphology in context with the frontal bone, nasal cavity structures, dentition, and upper cervical vertebrae. It also fits well in patient-education materials explaining expression lines of the glabella and the anatomical basis for targeted chemodenervation. Anatomical accuracy verified by SciePro's Medical Advisory Board.