Skeletal system

Skeletal system also known as skeleton is system of bones. Main parts of skeletal system are: Skull, Rib cage, Pectoral Girdle, Vertebral column, Pelvic Girdle, Upper Limbs, Lower Limbs. Skeleton has joints which are very important to human. Without joints we couldn't move. Skull defenses the Brain. Rib cage defenses Lungs, Heart, etc..