Clavicle
Clavicle, the only long bone lying in a horizontal position in the body, is an important bone of the shoulder girdle. It is, actually, a connection between the upper extremities and the chest. It receives its name from a Latin word “Clavicula” means ‘little key’ because just like a rotating key, it moves around its axis when upper extremities are moved away from the body (abduction). Commonly it is known as “collar bone” and “the beauty bone” because it is prominent in the females and the bulge it creates in considered an attractive feature.
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Clavicle
Clavicle is a long, horizontal, doubly curved bone lying at the root of the neck. This bone has got a: The lateral one third is a flattened part having two borders i.e. anterior and posterior, two surfaces i.e. superior and inferior. This part of the shaft has a backward bend with concavity formed at the anterior border. Upper surface is smooth and lower surface has a ridge called “trapezoid ridge” and an elevation called “conoid tubercle”. The medial two third is a rounded part and considered to have four surfaces with no prominent borders. This part has a forward bend with convexity at the anterior surface. The inferior surface has a longitudinal groove called “the subclavian groove”. The superior and the posterior surfaces have no important features. The medial end or sternal end is attached to clavicular notch of the manubrium sterni (upper part of sternum) to form a “sternocalvicular joint’’. The lateral or acromial end is attached to the acromian process of scapula to form “acromioclavicular” joint. From the lateral third From the medial two third It transmits the weight of the arms on the axial skeleton and acts as fulcrum allowing muscles to move the arm laterally. It allows the scapula to move freely on thoracic wall. Generally, it got no medullary cavity. In females it is shorter and lighter while the opposite is true in adult males.
Anatomical position
Shaft
Ends
Muscle attachments
Clinical importance
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