The clavicle (collar bone) is a unique long bone with several distinctive features: it is the only long bone that lies horizontally, is subcutaneous throughout, and is the first bone to begin ossifying; it is the only long bone that ossifies through membrane (intramembranous) rather than endochondral ossification, lacks a medullary cavity, and is the only long bone with two primary centers of ossification; additionally, it is occasionally pierced by the middle supraclavicular nerve.
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Peculiarities of Clavicle Bone | Unique Features of Collar BoneAdded:
Peculiarities of the clavicle. It is the only long bone that lies horizontally.
It is subcutaneous throughout. It is the first bone to start ossifying. It is the only long bone which ossifies in membrane. There is no medullary cavity.
It is the only long bone which has two primary centers of ossification.
It is occasionally pierced by the middle supraclavicular nerve.
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