HUMAN SKELETON -
Hard supportive or protective elements of the animal body form the skeleton system. It's study in osteology.
Present outside skin. It consists of nails, hair etc. Keratine protein present.
Covers the body. Produced by ectoderm. Consists of non-living material. May be moulted periodically during growth.
ENDO SKELETON -
Occurs inside body. Produced by mesoderm. Consists of skeletal tissue as bones & cartilage.