Procerus Muscle Beneath the Dermal Layer, Anterior View

Description

Positioned in the midline of the glabella, the procerus muscle (pyramidalis nasi) is shown anteriorly beneath a semi-transparent dermal layer in an adult male. Its fibers arise from the fascia over the nasal bone and upper lateral nasal cartilages, then run superiorly to blend with the frontalis and the overlying skin of the lower forehead. Laterally, the procerus sits between the medial portions of orbicularis oculi and adjacent nasal muscles, with the nasal bridge skeleton providing the firm deep boundary. Functionally, this small slip matters because it is the primary driver of transverse wrinkles over the bridge of the nose and contributes to medial brow depression, a pattern often targeted in aesthetic neuromodulator treatment for glabellar rhytids. Injection planning benefits from seeing how superficial the muscle is and how it interdigitates superiorly with frontalis, a common reason for unintended brow ptosis when toxin diffuses cranially. Respect for the nearby angular vessels and the course of the supratrochlear and infratrochlear nerves near the medial canthus keeps the focus on safe anatomy, not just surface lines. Small muscle. Big consequences. Use this artwork in facial anatomy and head and neck courses to correlate mimetic muscle vectors with skin creasing, and in dermatology or plastic surgery teaching files covering glabellar Botox patterns and complication avoidance. It also suits medical publishing on facial expression anatomy, reconstructive planning, and injection safety in the nasofrontal region. Anatomical accuracy verified by SciePro's Medical Advisory Board.