Masseter Muscle Beneath The Skin

Description

Presented in a left lateral view of the adult male face, the superficial cheek is opened to reveal the masseter as a thick, rectangular sheet overlying the lateral ramus and angle of the mandible, positioned inferior to the zygomatic arch and anterior to the parotid region. Superior and slightly posterior, the temporalis fans across the temporal fossa toward its insertion on the coronoid process, while the zygomaticus major and minor run obliquely anteroinferior from the zygomatic bone toward the modiolus. Around the eye and mouth, orbicularis oculi and orbicularis oris frame the palpebral fissure and oral aperture, providing orientation against the more vertically oriented fibers of the masseter. Hair-bearing scalp and facial hair remain intact, and the auricle sits posterior to the masseter along the lateral skull base. Clear landmarks. Masseter anatomy matters because it is the dominant elevator of the mandible and a key external landmark in temporomandibular disorder evaluation, dental occlusal assessment, and regional anesthesia planning. Palpation is performed just anterior to the mandibular angle during clenching, and hypertrophy from bruxism often presents as a widened gonial contour that can be mistaken for parotid enlargement. This lateral exposure also supports surgical teaching around the mandibular ramus, where care is taken to protect the marginal mandibular branch of the facial nerve during submandibular and lower-face approaches. Ideal for head and neck anatomy courses, dental and maxillofacial training modules, and clinical patient-education materials explaining mastication mechanics and jaw pain patterns, this illustration also suits textbooks covering facial musculature layers and surface landmarks. Anatomical accuracy verified by SciePro's Medical Advisory Board.