Called also os. There are 206 separate bones in the human body. Bones, ligaments, muscles, and tendons are the tissues of the body responsible for supporting and moving the body.
Some bones have a chiefly protective function.
An example is the skull, which encloses the brain, the back of the eyeball, and the inner ear. Some, such as the pelvis, are mainly supporting structures. Other bones, such as the jaw and the bones of the fingers, are concerned chiefly with movement. The bones themselves act as a storehouse of calcium, which must be maintained at a certain level in the blood for the body's normal chemical functioning. Bone is not uniform in structure but is composed of several layers of different materials.