Muscular system includes all of the bones and joints in the body
Integumentary system a branch of anatomy dealing with the bones
Skeletal system an organ system consisting of skeletal, smooth and cardiac muscles. It permits movement of the body, maintains posture, and circulates blood throughout the body
  Osteology                  the organ system that protects the body from various kinds of damage, such as loss of water or abrasion from                                                                         outside. The system comprises the skin and its appendages (including hair, scales, feathers, hooves, and nails).