Temporomandibular Joint
Pronunciation: tem-poh-roh-man-DIB-yoo-lar
The bilateral synovial joint connecting the mandible to the temporal bone of the skull, enabling jaw movement for mastication, speech, and swallowing.
Full Definition
The temporomandibular joint (TMJ) is a complex, bilateral synovial hinge-and-gliding joint formed between the condylar head of the mandible and the glenoid fossa of the temporal bone, with an intervening articular disc. It permits both rotational and translational movements essential for mastication, phonation, and deglutition. Dysfunction of this joint — classified as temporomandibular disorder (TMD) — may produce pain, clicking, locking, or limited range of motion. In clinical documentation, editors must distinguish references to the anatomical structure (TMJ) from the broader disorder category (TMD). The abbreviation TMJ is widely used in clinical and patient-facing texts.
Usage
Usage note: Abbreviate to TMJ after first use; do not use 'TMJ disorder' — prefer 'TMD' or 'temporomandibular disorder' for the condition itself.
In Context
- "The radiograph revealed flattening of the condylar head consistent with degenerative changes of the temporomandibular joint." — Oral and maxillofacial radiology report
- "Patients presenting with clicking on mouth opening should be assessed for temporomandibular joint dysfunction before prosthetic treatment planning." — Prosthodontic clinical notes