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Adult Skeletal System Essay

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The adult skeleton is composed of a total of 213 bones. The skeleton is divided in two main division, the appendicular skeleton with 126 bones and the axial skeleton with 74 bones. Bones are grouped into four general categories; long bones, short bones, flat bones, and irregular bones. Long bones include the clavicle, humeri, radii, ulnae, metacarpals, femurs, tibia, fibulae, metatarsals and phalanges. The short bones include the carpal and tarsal bones, patellae, and sesamoid bones. The flat bones are made of the skull, mandible, scapulae, sternum, and ribs. And finally, irregular bones are composed of vertebrae, sacrum, coccyx, and hyoid bone.
The skeleton system provides structural support, protect vital internal organs and structures, provide maintenance of mineral homeostatic and acid-base balance, and permit movement and locomotion by providing levers for the muscles. Long bones in the skeleton system are composed of hollow shaft, or diaphysis; flared, cone-shaped metaphysis located below the growth plates; and rounded epiphysis located above the growth plates. The diaphysis is made primarily of dense cortical bone, the metaphysis and epiphysis in the other hand are mainly made of trabecular meshwork of bone surrounded by a relatively thin cortical bone.67 …show more content…
Both cortical and trabecular bones are composed of osteons. In cortical bone osteons are called Harversian systems, which are cylindrical shape structure of approximately 400 mm long and 200 mm wide at their base, and form an extensive branching network106. Harversian system walls are formed of concentric lamellae and are aligned with the long axis of the bone. Adjacent Harversian canals are connected by Volkmann’s canals which ran perpendicular to the long axis of the bone. Both Harversian and Volkmann’s canal house blood vessels and

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