Question

The floating ribs are

• A. 11${}^{th}$ and 12${}^{th}$
• B. 9${}^{th}$ and 10${}^{th}$
• C. 7${}^{th}$ and 8${}^{th}$
• D. 1${}^{st}$ and 2${}^{nd}$

Answer 1

The correct option is A 11${}^{th}$ and 12${}^{th}$

In humans, there are normally 12 pairs of ribs. The first seven pairs are attached directly to the sternum by costal cartilages and are called true ribs. The 8${}^{th}$, 9${}^{th}$ and 10${}^{th}$ pairs are called as false ribs which do not join the sternum directly but are connected to the 7${}^{th}$ rib by cartilage. The 11${}^{th}$ and 12${}^{th}$ pairs are called floating ribs. Floating ribs do not attach to the sternum or to another rib.

So, the correct answer is '11${}^{th}$and 12${}^{th}$'.