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SKELETAL SYSTEM - SKELETAL SYSTEM The skeletal structure is...

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SKELETAL SYSTEM The skeletal structure is strong, yet light and is almost perfectly adapted for the protective, locomotor, and manipulative functions it performs. The skeleton is composed of bones, cartilage, joints, and ligaments and accounts for about 20% of body mass, weighing about 30 pounds in a 160 pound man. There are 206 bones in the human skeleton and they are divided into the axial and appendicular skeleton. The axial skeleton forms the long axis of the body and includes the bones of the skull, vertebral column, and rib cage. The appendicular skeleton consists of the bones of the upper and lower limbs and the girdles that attach the limbs to the axial skeleton. Classification: Almost all the bones of the body may be classified into four principal types on the basis of shape: long bones, short bones, flat bones, and irregular bones Surface Markings: The surface of bones reveal various structural features adapted to specific functions. Long bones have rounded ends for forming sturdy joints. They provide adequate
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