In anatomy, the clavicle or collar bone is a bone that makes up part of the shoulder girdle.
It articulates with the sternum medially and the acromion, part of the scapula, laterally. It is part of the shoulder girdle and together with the scapula, allows for the free range of motion of the arms. Compare this with the limited range of motion of the legs.
Its lateral part is smooth, and corresponds to the interval between the attachments of the Pectoralis major and Deltoideus; its medial part forms the lower boundary of an elliptical surface for the attachment of the clavicular portion of the Pectoralis major, and approaches the posterior border of the bone.
This surface, at the junction of the curves of the bone, is also in relation with the brachial plexus of nerves and the subclavian vessels.
The lower part of the facet is continued on to the inferior surface of the bone as a small semi-oval area for articulation with the cartilage of the first rib.
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