What are the different types of rib bones that form the rib cage?

Explanation

There are 12 pairs of ribs. Each rib is a thin flat bone connected dorsally to the vertebral column and ventrally to the sternum. It has two articulation surfaces on its dorsal end, hence called bicephalic. The first seven pairs of ribs are called ‘true ribs’ or vertebra-sternal ribs. Dorsally they are attached to the thoracic vertebrae and ventrally connected to the sternum with the help of hyaline cartilages. The `8^(th)`, `9^(th)`, `10^(th)`, pairs of ribs do not articulate directly with the sternum, but joined with the cartilaginous (hyaline cartilage) part of the seventh rib. These are called ‘false ribs’ or vertebro-chondral ribs. The last `11^(th)` and `12^(th)` pairs of ribs are not connected ventrally. Therefore, they are called as floating ribs or vertebral ribs. Thoracic vertebrae, ribs, and sternum together form the ribcage.