The skeletal system includes the bones and joints. The functions of the bones are support of the body and its organs, protection of soft body parts, production of blood cells, and storage of inorganic calcium and phosphorus salts. The skeletal system also works together with the muscular system to produce movement. The anatomy of a long bone is discussed as are the actions of the bone building osteoblast and bone destroying osteoclast cells. Fractures are breaks in bone and the classification of fractures is explained. The repair of a fracture always involves the formation of a hematoma, a fibrocartilage callus, a bony callus, and finally, bone remodeling. The skeleton is divided into an axial portion and an appendicular portion. The structures and functions of the bones in each of these portions are described. The axial skeleton includes the skull, hyoid bone, vertebral column, and thoracic cage. The appendicular skeleton includes the bones of the pectoral girdle, upper limbs, pelvic girdle, and lower limbs. Joints are articulations between bones and are classified according to the amount of movement they allow as immovable joints, slightly movable joints, and freely movable joints. Different types of freely movable joints and classification of movement at joints are also discussed.