The temporomandibular joint (TMJ) is an atypical synovial joint located between the condylar process of the mandible and the mandibular fossa and articular eminence of the temporal bone. It is divided into superior discotemporal space and inferior dicomandibular space by the TMJ disc (or meniscus).
The joint is surrounded by a capsule which is attached inferiorly to the head of the condyle (above the pterygoid fovea - attachment of the inferior belly of the lateral pterygoid muscle) and superiorly to the margins of the mandibular fossa (posteriorly) and articular eminence (anteriorly) of the temporal bone.
Laterally it is strengthened by a thickening, the tempromandibular ligament.
Normally the disc lies above the condyle, with the junction of the posterior band and intermediate zone within 10 degrees of vertical. Using this measurement however, up to 33% of asymptomatic individuals have displaced discs. Thus some authors suggest using 30 degrees as the cut off to improve specificity.
- Xavier Tomas, Jaume Pomes, Juan Berenguer, Llorenç Quinto, Carlos Nicolau, Josep Maria Mercader, and Vicente Castro "MR Imaging of Temporomandibular Joint Dysfunction: A Pictorial Review" RadioGraphics 2006 26: 765-781.
- Oliver J. Sommer, Felix Aigner, Ansgar Rudisch, Hannes Gruber, Helga Fritsch, Werner Millesi, and Michael Stiskal "Cross-sectional and Functional Imaging of the Temporomandibular Joint: Radiology, Pathology, and Basic Biomechanics of the Jaw" RadioGraphics 2003 23: e14; published online as 10.1148/rg.e14
- Gray's Anatomy 39th Edition, Elsevier
Synonyms & Alternative Spellings
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|Temporomandibular joint (TMJ)||✗|