Temporal Muscle Under the Skin

Description

Over the lateral cranium, the temporalis muscle is rendered beneath the scalp and temporalis fascia, filling the temporal fossa on the squamous part of the temporal bone and extending superiorly onto the parietal bone up to the temporal lines. Its fibers converge inferiorly as a tendon that passes deep to the zygomatic arch to insert on the coronoid process and anterior border of the mandibular ramus, placing the muscle anterosuperior to the external ear region and lateral to the cranial vault. Anteriorly, the frontal bone and nasal bones frame the upper face, while the maxilla and upper dentition sit inferior to the orbit and anterior to the mandibular articulation. The thoracic cage and shoulder girdle appear inferiorly in partial view. A broad anatomical context. Mastication depends on temporalis power and vector, and this lateral craniofacial view makes the muscle’s fan-shaped architecture easy to relate to mandibular elevation and retrusion. Clinically, temporalis tendon pain and hypertrophy are common in bruxism and temporomandibular disorders, and botulinum toxin targeting requires a clear sense of the muscle’s superior extent relative to the temporal lines and its inferior course toward the coronoid process. Surgeons also reference this anatomy in pterional craniotomy planning, where incision placement and dissection planes must respect the temporalis fascia to reduce postoperative atrophy and jaw weakness. Use this illustration for head and neck anatomy teaching, dental and oral surgery texts discussing mandibular biomechanics, and maxillofacial or neurosurgical atlases that need a clean correlation between skull landmarks and the temporalis muscle under skin. It also suits patient education materials on jaw clenching, temporalis myalgia, and temporalis tendonitis when paired with temporomandibular joint diagrams. Anatomical accuracy verified by SciePro's Medical Advisory Board.