Question

$8^{th}$ and $9^{th}$ ribs are called as false because they are attached to the

• A. Xiphisternum.
• B. $6^{th}$ intercostal.
• C. $7^{th}$ intercostal.
• D. Diaphragm.

Answer 1

Answer: (C)

$7^{th}$ intercostal.

The first seven pairs of ribs are attached directly to the sternum by costal cartilages and are called true ribs. However, 8th, 9th and 10th ribs are known as false ribs because they do not join sternum directly and they are attached to the coastal cartilage of the 7th rib. Similarly, 11th and 12th ribs are known as floating ribs which are only connected to a person's backbone and not to the sternum. Hence, the correct answer is option C.