Which ribs are considered true ribs?

Which ribs are considered true ribs?

• A. Ribs 1-7
• B. Ribs 2-6
• C. Ribs 8-12
• D. Ribs 1-5

Answer: (B)

Direct attachment to the sternum defines true ribs. The first seven pairs connect to the sternum through their own costal cartilages, giving them a direct, independent link to the chest wall. The remaining ribs do not attach directly: ribs 8 through 10 connect to the cartilage of the rib above (indirect attachment to the sternum), and ribs 11 and 12 do not attach to the sternum at all (floating). So, the true ribs are the top seven pairs, which is why that option is correct.

Direct attachment to the sternum defines true ribs. The first seven pairs connect to the sternum through their own costal cartilages, giving them a direct, independent link to the chest wall. The remaining ribs do not attach directly: ribs 8 through 10 connect to the cartilage of the rib above (indirect attachment to the sternum), and ribs 11 and 12 do not attach to the sternum at all (floating). So, the true ribs are the top seven pairs, which is why that option is correct.