Procerus, Gross Anatomy

Description

Centered over the glabella, the procerus (pyramidalis nasi) is highlighted as a short, vertically oriented slip arising from the nasal bone and upper lateral nasal cartilages and blending superiorly with the epicranial aponeurosis and frontalis. Medially it lies between the paired corrugator supercilii muscles, while laterally its fibers interdigitate with the nasalis along the nasal bridge. Surrounding context includes orbicularis oculi encircling the palpebral fissure, the masseter on the lateral ramus of the mandible, and the sternocleidomastoid descending obliquely from mastoid process to sternum and clavicle. Small muscle. Clear landmarks. Depressor action on the medial brow and glabellar skin makes the procerus a key contributor to transverse rhytids over the nasal root and the characteristic frown complex, working in concert with corrugator supercilii to draw the eyebrows inferomedially. This specific midline location matters in aesthetic injectables, since botulinum toxin placement too inferior can diffuse toward the levator palpebrae superioris via the superior orbital septum region and contribute to upper eyelid ptosis, while incomplete treatment leaves persistent glabellar lines. Surgeons also use the procerus as a superficial landmark when raising nasal dorsal or glabellar flaps, where careful dissection protects the angular vessels and the supratrochlear neurovascular bundle emerging superior-medial to the orbit. Facial anatomy courses and head and neck dissections use this plate to teach the layered relationship between the nasal root musculature, frontalis-aponeurotic continuity, and the periorbital sphincter. It also suits dermatology and plastic surgery atlases illustrating frown-line treatment planning and complication avoidance around the glabella. Anatomical accuracy verified by SciePro's Medical Advisory Board.