Masseter, Gross Anatomy

Description

Occupying the lateral cheek, the masseter muscle is highlighted as a broad, quadrilateral sheet spanning from the zygomatic arch superiorly to the lateral surface of the mandibular ramus and angle inferiorly. Its fibers descend with a slight posterior sweep, lying superficial to the mandibular ramus and posterior to the modiolus and orbicularis oris, while the parotid region sits posterolateral near the auricle as a surface landmark. Grayscale facial and cervical musculature frames the field, including the temporalis over the temporal fossa and straplike neck muscles descending inferiorly from the mandible and hyoid region. Orientation is clear. For teaching mastication mechanics, this view makes the masseter’s line of pull easy to read, and it pairs naturally with the temporalis to explain mandibular elevation and clenching forces at the molars. Clinically, hypertrophy of the masseter is a common contributor to benign “square jaw” contouring and bruxism-related myalgia, and the muscle’s relationship to the mandibular angle helps explain why injections for cosmetic reduction or pain management must respect adjacent parotid tissue and the course of the facial nerve branches across the cheek. A dependable landmark. Use this plate in head and neck gross anatomy, dental anatomy, and oral and maxillofacial surgery teaching when you need a clean identification of the masseter against surrounding facial muscles, or in patient-facing materials explaining temporomandibular disorder, clenching, and injection targets in the cheek. Anatomical accuracy verified by SciePro's Medical Advisory Board.