2. Apendicular Skeleton
It consists of two pairs of girdles and the bones of arms and legs.
•    Girdles : Girdles are attached to the axial skeleton. These give support to the bones of the limbs. The girdle that supports the bones of arms is called the pectoral girdle. The pectoral girdle is made up of four shoulder bones, two clavicles and two scapulae. Each arm is supported by one scapula and one clavicle. The girdle into which the bones of legs are fitted is called the pelvic girdle.
•    Bones of Arms : In the upper arm there is only one bone. It is called humerus. The humerus has a ball-shaped head that exactly fits into the cavity in the pectoral girdle. On the lower side, it has a broad surface which is connected to two bones of the lower arm. TIle broad bone towards the thumb is called radius. The narrow bone that is placed towards the little finger is called ulna. In the wrist, you will find small bones called carpals. The palm consists of five long bones called metacarpals. The fingers consist of small bones called phalanges.

•    Bones of Legs : The bone present in the thigh is the longest bone of the body. it is identified as femur. It has a ball-shaped head that can be fitted into a cavity formed by the pelvic girdle. The lower end of the femur is articulated with two leg bones called tibia and fibula. At the knee, there is an additional bone called patella. Down below in the ankle there are the tarsals. The foot is supported by metatarsals and toes of the foot that contain phalanges to support them.

Functions of Skeleton :
l.    It supports the body and gives definite shape to it.
2.    It helps to protect delicate and vital organs like heart, lungs and brain.
3.    With the help of muscles, it helps in the movement of body parts.
4.    It is a store house of minerals and is the place for the formation of RBCs.