The skeletal system has five main functions: movement, support, protection, blood cell production, and mineral storage. It is made up of bones and joints, with four basic bone shapes. The document describes the main bones in the skull, spine, shoulders, arms, hands, pelvis, legs, and feet. It also outlines the different joint types and connectors like ligaments and tendons. Common skeletal system problems are discussed like fractures, dislocations, sprains, arthritis, scoliosis, and osteoporosis.