Collarbone

Clavicle , clavicula, is a small S-shaped bone. It has a body, corpus claviculae, and two ends: the sternum, facing the sternum arm, and the acromial, connecting with the acromion. The sternum and the adjacent area of ​​the clavicle are curved forward, and the rest of the clavicle is curved backward.

The middle portion of the clavicle , located between its ends, is somewhat squashed from top to bottom. On its lower surface is a relatively large nutritional hole, foramen nutricium. At the sternal end, the rib-clavicular ligament is impressed, impressio lig. Costoclavicularis, and at the humeral end - a cone-shaped tuberculum, tuberculum conoideum, and a trapezoid line, linea trapezoidea (the attachment sites of the conical and trapezius parts of the coronary-clavicular ligament, lig. Coracoclaviculare). On the lower surface of the clavicle, closer to the acromial end, lies the groove of the subclavian muscle , sulcus m. Subclavia.

The upper surface of the clavicle is smooth. The sternal end, extremitas sternalis, is thickened and carries on its internal surface the sternal articular surface, fades articularis sternalis - the junction of the clavic notch on the sternum arm.

The acromial end, extremitas acromialis, is wider than the sternum, but somewhat thinner than it.
On its external part is the acromial articular surface, facies articularis acromialis, articulating with the acromion of the scapula .

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