The human skeleton has 206 bones. Bones form the shape of the embryo. The skeleton in the embryo stage of flexible cartilage, but within a few weeks it begins the process of ossification (pronounced: ah-suh-fuh-kay-shun). Ossification is the process of replacing the cartilage by hard deposits of calcium phophate, More..

Partially movable, or cartilaginous (pronounced: kar-tuh-lah-juh-nus), joints move a little. Cartilage links them, as in the spine. vertebrae movements in the spine give flexibility . Each of the vertebrae in the spine moves in relation to the one above and below it. More..