Bone Classification
Bones can be classified into four main shapes: long, short, flat, and irregular. Long bones, such as the femur, are longer than they are wide and primarily function in movement. Short bones, like the carpals, are roughly cube-shaped and provide stability. Flat bones, such as the skull, protect internal organs, while irregular bones, like the vertebrae, have complex shapes that serve various functions.
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Structural Joint Classifications
Long Bones
Long bones are characterized by a greater length than width and consist of a shaft (diaphysis) and two ends (epiphyses). They are primarily composed of compact bone, which provides strength, and contain marrow for blood cell production. Examples include the humerus and tibia, which play crucial roles in locomotion and support.
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Flat Bones
Flat bones are thin and often curved, providing extensive surface area for muscle attachment and protection for underlying organs. They are primarily composed of two layers of compact bone with a layer of spongy bone in between. Examples include the sternum and ribs, which protect vital organs in the thoracic cavity.
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Short, Flat, and Irregular Bones