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Clavicle
In human anatomy, the clavicle or collarbone is a long bone that serves as a strut between the shoulder blade and the breastbone. There are two clavicles, one on the left and one on the right. The clavicle is the only long bone in the body that lies horizontally. Together with the shoulder blade it makes up the shoulder girdle. It is palpable in all people; in people who have less fat in this region, the location of the bone is clearly visible, as it creates a bulge in the skin. It receives its name from the (ラテン語:clavicula) ("little key") because the bone rotates along its axis like a key when the shoulder is abducted.
==Structure==
The collarbone is a doubly curved bone that connects the arm to the body (trunk). Located directly above the first rib it acts as a strut to keep the scapula in place so that the arm can hang freely. Medially, it articulates with the manubrium of the sternum (breast-bone) at the sternoclavicular joint. At its lateral end it articulates with the acromion of the scapula (shoulder blade) at the acromioclavicular joint. It has a rounded medial end and a flattened lateral end.
From the roughly pyramidal sternal end, each collarbone curves laterally and anteriorly for roughly half its length. It then forms a smooth posterior curve to articulate with a process of the scapula (acromion). The flat acromial end of the collarbone is broader than the sternal end. The acromial end has a rough inferior surface that bears a ridge, the trapezoid line, and a small rounded projection, the conoid tubercle (above the coracoid process). These surface features are attachment sites for muscles and ligaments of the shoulder.
It can be divided into three parts: medial end, lateral end and shaft.
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「Clavicle」の詳細全文を読む
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