The Rib Cage or the Thoracic cage consists of 37 Bones.
It is formed by:
a) One Sternum Bone (Also called as Breast Bone): It consists of the Manubrium, the body and Xiphoid Process.
b) Twelve pairs of Ribs:
1) TRUE RIBS: 1st to 7th pair of ribs. (Vertebrosternal ribs)
2) FALSE RIBS: 8th to 10th pair of ribs. (Vertebrochondral ribs)
3) FLOATING RIBS: 11th to 12th pair of ribs (Vertebral Ribs)
4) GORILLA RIBS: 13th pair of ribs (Extra Rib. Only present in some individuals)
c) Twelve Thoracic vertebrae