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The Skeletal System is the most important system of the body. The bones are made of about four layers. The outside part of the bones is called periosteum. The next layer is called the compact bone. All the inside is divided, at the edges you have the spongy bone and at the middle you have the marrow. The whole skeleton is made up of 206 bones. When a baby is born, it’s born with 270 small bones. As the baby grows some of these bones are fused together.

There are nineteen important bones. They are: Skull, Clavicle, Scapula, Ribs, Sternum, Humerus, Vertebrae, Radis and Ulna, Carpus, Metacarpus, Phalanges, Pelvis, Femur, Patella, Fibula, Tibia, Metatarsals, Tarsals, and Phalanges. There are different types of skeletons.  They are: the internal skeleton (also called the endo skeleton), the axial skeleton, which runs length wise down the center of the body, and the appendicular skeleton which is made of bones that support the appendages. The skeleton has 33 vertebrates. Those are the main parts of the skeletal system.