· The clavicle is anatomically classified as a “long bone.” As such it is the only long bone in the body that lies horizontally.
· It is the first bone to begin the process of ossification during development of the embryo, during the fifth and sixth weeks of gestation.
· It is one of the last bones to finish ossification, at about 21-25 years of age.
· In birds, the clavicles fuse to form a single Y-shaped bone, the “furcula” or what we call the “wishbone.”
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