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The clavicle, commonly known as the collarbone, is classified as a long bone. Long bones are characterized by their elongated shape and are typically found in the limbs. They consist of a shaft (diaphysis) and two ends (epiphyses), which allows for greater mobility and leverage in movement.

The structure of the clavicle supports its primary functions, which include connecting the arm to the body and facilitating a wide range of shoulder movements. Its long, slender shape provides stability to the shoulder girdle while allowing for necessary flexibility.

In contrast, flat bones, like the sternum or skull bones, serve primarily protective functions and have a broader surface area. Short bones, such as those found in the wrists and ankles, are approximately as wide as they are long and provide stability and support with limited movement. Irregular bones, which include vertebrae and certain facial bones, have complex shapes that do not fit into the other categories and often have specific functions related to protection or support.

The classification of the clavicle as a long bone underlines its significance in skeletal structure and function, particularly in its role in supporting the upper limb and facilitating movement.