Masseter Muscle

Description

Masseter muscle morphology is presented on the lateral face, with dense superficial and deep fascicles spanning from the zygomatic arch superiorly to the lateral surface of the mandibular ramus and angle inferiorly. Fibers run predominantly inferoposteriorly, forming the thick muscular curtain that contours the male jawline, while the mandibular body extends anteriorly toward the symphysis. Deep to the masseter, the mandibular ramus frames the region of the mandibular notch and condylar process posteriorly. This is a powerful muscle. Functional anatomy of the masseter matters any time you are discussing mastication mechanics or temporomandibular joint loading. Hypertrophy from bruxism or chronic clenching often produces a firm enlargement at the mandibular angle and can be mistaken on exam for parotid pathology, while myofascial trigger points in the masseter refer pain to the molars and preauricular region. For procedural planning, the muscle’s thickness and its relationship to the mandibular angle guide botulinum toxin injection patterns aimed at reducing bite force while avoiding unwanted spread toward the parotid gland and adjacent facial nerve branches. Use this artwork in head and neck anatomy teaching blocks, dental and orthodontic curricula focused on occlusion and masticatory muscles, and surgical or aesthetic references addressing mandibular angle contouring and lower-face asymmetry. It also suits patient-facing explanations of bruxism-related masseter hypertrophy and temporomandibular disorder myalgia. Anatomical accuracy verified by SciePro's Medical Advisory Board.