A small bursa may develop between the temporalis tendon and the coronoid process of the mandible, reducing friction as the temporalis tendon glides over the coronoid apex during wide mouth opening. It is an adventitial structure not consistently present and is relevant primarily in coronoid hyperplasia where the enlarged coronoid creates abnormal friction with the temporal fascia and temporalis tendon.
The temporal coronoid bursa is relevant in the surgical management of coronoid hyperplasia (coronoid elongation causing trismus), where the enlarged coronoid impinges on the inner surface of the zygomatic arch during mouth opening. Bursitis at the coronoid-temporalis interface contributes to the pain in coronoid process syndromes. Coronoidectomy to relieve the impingement also removes the mechanical stimulus for bursal formation in this region.
An elongated coronoid process impinging against the temporal fascia and zygomatic arch creates friction at the temporalis tendon-coronoid interface, potentially producing a small adventitial bursa contributing to the pain of coronoid hyperplasia alongside the mechanical trismus from arch impingement.
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