On each side, the clavicle extends horizontally from the manubrium of the sternum medially to the acromion of the scapula laterally. It is typical 13-15 cm in length. The medial two-thirds is convex anteriorly and roughly quadrilateral in cross-section. The lateral one third is concave anteriorly and flatter.
The anterosuperior surface of the bone is smoother than the inferior surface and lies subcutaneously. It is crossed by the supraclavicular nerves and occasionally a communication between the external jugular and cephalic veins.
The clavicle can be divided into three sections:
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