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Masseter Tendon

tendo musculi masseteris

The masseter inserts via two tendinous layers: the superficial head tendon inserts on the angle and lower lateral ramus of the mandible, while the deep head tendon inserts on the upper lateral ramus and the lateral surface of the coronoid process. The tendinous insertions of the masseter are concentrated at the mandibular angle posteroinferiorly, with fibres fanning anterosuperiorly. The muscle and its tendon are palpable at the mandibular angle during clenching.

Region: Head & Skull

Clinical Relevance

Clinical Notes

Masseter tendinopathy produces pain at the mandibular ramus angle during chewing, clenching, and wide mouth opening, contributing to the myofascial pain component of temporomandibular disorder. Botulinum toxin injection into the masseter reduces its bulk in TMD management and for cosmetic facial slimming. Masseter detachment and subperiosteal dissection of its mandibular angle insertion is performed in sagittal split ramus osteotomy, orthognathic surgery, and mandibular angle reduction for facial contouring. Masseter hypertrophy produces mandibular angle widening visible as facial fullness at the jaw.

Pathology

Common Injuries & Conditions

Masseter Myofascial Pain in TMD

Masseter tendon and muscle trigger points from parafunctional habits (bruxism, clenching) produce pain at the mandibular angle that radiates to the lateral face, ear, and temporal region, managed with splint therapy, physiotherapy, and botulinum toxin injection into the masseter belly.