The bones of the human skeletal system are of varied shapes, sizes, and functions. For example, the vertebrae and facial bones have flat surfaces, arches, and multiple processes that give them a composite, irregular shape. Lastly, bones with complex shapes are classified as irregular bones. They are thin, and plate-like, and though termed flat, are usually curved. The third type is flat bones, exemplified by the scapulae, sternum, and bones of the skull. The patella, or kneecap, is a sesamoid bone found at the knee joint. Sesamoid bones are similar to short bones but are more rounded and flatter and are embedded within tendons or muscles. The carpals of the wrist and tarsals of the ankle are examples of short bones. In contrast, short bones have a cube-like appearance, with roughly equal sides. Most bones in the limbs, such as the femur, humerus, and finger bones, are of this type. Long bones are cylindrical and longer than they are wide. Finger fractures.The adult human skeleton typically comprises 206 bones, which are primarily classified on the basis of shape as long, short, flat, and irregular. What is bone?.Īmerican Academy of Orthopaedic Surgeons. National Institute of Arthritis and Musculoskeletal and Skin Diseases. Human biological variation in sesamoid bone prevalence: the curious case of the fabella. Hiding within the cracks: case report of rare sutural bone found at the nasion. Structure of bone tissue.Įdwards B, Wang JM, Iwanaga J, et al. Classifications in brief: Salter-Harris classification of pediatric physeal fractures. doi:10.3390/healthcare10020367Ĭepela DJ, Tartaglione JP, Dooley TP, Patel PN. Clinical management of intraosseous access in adults in critical situations for health professionals. Classification of bones.Īstasio-Picado Á, Cobos-Moreno P, Gómez-Martín B, Zabala-Baños MDC, Aranda-Martín C.
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