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pivot joint
A pivot joint (trochoid joint, rotary joint, lateral ginglymus) is a type of synovial joint. In pivot joints, the axis of a convex articular surface is parallel with the longitudinal axis of the bone.
Pivot and hinge joints can be both considered cylindrical joints.〔Platzer, Werner (2008) ''Color Atlas of Human Anatomy'', Volume 1, (p.28 )〕
==Movements==
Pivot joints allow for rotation, protraction, retraction,twist, flexion, extension, adduction and abduction, which can be external (for example when rotating an arm outward), or internal (as in rotating an arm inward). When rotating the forearm, these movements are typically called pronation and supination. In the standard anatomical position, the forearms are supinated, which means that the palms are facing forward, and the thumbs are pointing away from the body. In contrast, a forearm in pronation would have the palm facing backward and the thumb would be closer to the body, pointing medially.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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