Question

How many clavicles have we got​

Answer 1

In humans the two clavicles, on either side of the anterior base of the neck, are horizontal, S - curved rods that articulate literally with the outer end of the shoulder blade (the acromion) to help to form the shoulder joint; they articulate medially with the breastbone ( sternum ).
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Answer 2

The clavicles are horizontal, S-curved rods that articulate laterally with the outer end of the shoulder blade to assist form the shoulder joint in humans. They are located on either side of the anterior base of the neck.

Explanation:

The clavicle can be born with a decreased or nonexistent clavicle, and its strength varies depending on the degree of muscle development. Horizontal force to the shoulder, such as from a fall or trauma, is a major cause of clavicle fractures, especially in the centre of the bone.