What is Skeletal System? The hard parts of an animal body present inside or outside the body collectively form the skeletal system or Skeleton. Types of Skeleton: Skeleton is of two types- Exoskeleton and Endoskeleton. Exoskeleton: It is protective and supportive framework present outside the body. An exoskeleton is made up of hard structures or dead tissues. It is present in invertebrates as well as vertebrates. Calcareous shells of Snails (Molluscs), Chitinous and sclerotized plate of insects (Arthropods) are examples of the exoskeleton in Invertebrates. Scales (Dermal) in fishes, epidermal scales in reptiles, feathers, hairs, claws, nails, hoofs, horns in … Continue reading Skeletal System