Page 2 - CH-8-8.3 PARTS OF SKELETON_ RIBCAGE---FUNCTIONS OF SKELETON_

1. RIBCAGE :

 Ribs are curved bones in the body. There are 24 bones or 12 pairs of curved

bones or ribs.
 The ribs are curiously bent. Out of these 12 pairs, 10 pairs join the breast
bone in the front and the back bone at the back together to form a cage-
like structure or box. This is called a ribcage.
 Ribcage protects the internal organs of the body like heart and lungs.
 Two ribs are free as they are only attached to the backbone and not to the
breastbone and are called floating ribs.
 The ribs allow certain kind of movement of the chest during breathing.

RIBS
RIBCAGE

FLOATING

RIBS

2. LIMBS :

 The human body has two pairs of limbs :
1. FORELIMBS - the arms are known as the forelimbs.
2. HIND LIMBS - the legs are known as the hind limbs.
 The bone in the upper arm is called the humerous

 The elbow joins the upper arm and the forearm. There are two bones in the
forearm.
 A no. Of small bones make up the hand and the wrist.
 The thigh has the longest bone of the body called the femur.
 It bears the weight of the whole body.
 The knee joins the thigh and the lower leg. There are two bones in the
lower leg.
 Many small bones are present in the ankle and the feet.

 The stirrup is the smallest bone in the body. It is found inside the ear. It is
almost half the size of a rice grain.