Temporomandibular joint

Japanese: 顎関節 - がくかんせつ（英語表記）temporomandibular joint

This joint is formed by the condyle of the mandible and the condyle fossa on the underside of the temporal bone. There is an articular disk between the two and a joint capsule around it. The movement of this joint allows the mandible to move and open and close the mouth, i.e., to chew and speak, so it is the joint that is most overused in the human body. If the function of this joint is impaired by fractures or dislocations due to trauma, or by various causes such as temporomandibular joint inflammation, temporomandibular joint disorder, or ankylosis of the temporomandibular joint, it can cause malocclusion.

Source: Encyclopaedia Britannica Concise Encyclopedia About Encyclopaedia Britannica Concise Encyclopedia Information

Japanese:

下顎骨の関節突起と，側頭骨下面の関節窩で構成される関節。両者の間に関節円板，周囲に関節嚢がある。この関節の運動によって下顎骨が動いて，口の開閉すなわち咀しゃくや談話が可能になるので，人体のなかで最も酷使されている関節といえる。この関節の機能は，外傷などによる骨折や脱臼，種々の原因による顎関節炎や顎関節症，顎関節強直症などで阻害されると，咬合異常を起す。

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