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Skeleon sytem is the system of our body which supports and give shape to our body. The main parts of our skeleton system are -

BONES AND CARTILAGE

Bone is defined as the hard connective tissue made up of calcium and phosphorus salt and Cartilage is the very soft bony structure which made up of flexible tissues. There are 206 bones present in our body. In an infant, there are 350 bones are present which are very small as we grown up, all the bones are fused together which after that remains only 206. Our skeleton system having four parts.

First part is known as SKULL - It is a structure of eight flattened bones joint together which gives shape to our head, skull also protects our brain. Skull is divided into two parts, the upper part is known as caranium which having 8 bones and second part is known as facial which contains 12 bones, the only movable part of skull is lower jaw.

Second part is our CHEST REGION - Chest region consists of Ribcage (24 bones, it protects our heart and lungs) and spine (it protects our spinal cord and is made up of 33 small ring like structure which is known as vertebrae.

Third part is our LEGS AND ARMS- which helps in movement of our whole body, there are 60 bones present in our arms and 60 bones present in our legs.

Fourth part is our PELVIS REGION- in which four bones are present and which keeps our backbone in proper posture.