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Shoulder joint
The shoulder joint, (or glenohumeral joint from Greek ''glene'', eyeball, + -''oid'', 'form of', + Latin ''humerus'', shoulder), is a multiaxial synovial ball and socket joint and involves articulation between the glenoid cavity of the scapula (shoulder blade) and the head of the humerus (upper arm bone). Due to the very loose joint capsule that gives a limited interface of the humerus and scapula, it is the most mobile joint of the human body.
==Structure==
The shoulder joint is a ball and socket joint between the scapula and the humerus. However the socket of the glenoid cavity of the scapula is itself quite shallow and is made deeper by the addition of the glenoid labrum. The glenoid labrum is a ring of cartilaginous fibre attached to the circumference of the cavity. This ring is continuous with the tendon of the biceps brachii above.
Between the associated muscles of the shoulder is an anatomic space called the axillary space which transmits the subscapular artery and axillary nerve.
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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