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The ball and socket joint (or spheroidal joint) is a type of synovial joint in which the ball-shaped surface of one rounded bone fits into the cup-like depression of another bone. The distal bone is capable of motion around an indefinite number of axes, which have one common center. It enables the bone to move in many places (Nearly all directions). An enarthrosis is a special kind of spheroidal joint in which the socket covers the sphere beyond its equator.〔Platzer, Werner (2008) ''Color Atlas of Human Anatomy'', Volume 1, (p.28 )〕 ==Examples== Examples of this form of articulation are found in the hip, where the rounded head of the femur (ball) rests in the cup-like acetabulum (socket) of the pelvis, and in the glenohumeral joint of the shoulder, where the rounded head of the humerus (ball) rests in the cup-like glenoid fossa (socket) of the shoulder blade.〔 And the phalanges (toes, fingers).(Module - Introduction to Joints )〕 It should be noted that the shoulder includes a sternoclavicular articulation joint. File:Kugelgelenk.jpg|Hip File:Gray327.png|Shoulder File:Ball and Socket Joint (Hip joint).svg|Details of hip joint. 1. Femur 2. Femoral Neck 3. Femoral Head 4. Acetabulum 5. Acetabular Labrum 6. Pelvis 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「ball and socket joint」の詳細全文を読む スポンサード リンク
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