What is the primary feature of false ribs in human anatomy?

The primary feature of false ribs is that they do not attach directly to the sternum. In human anatomy, ribs are categorized into true ribs, false ribs, and floating ribs based on their connection to the sternum. True ribs, the first seven pairs, have a direct connection to the sternum via individual costal cartilages. False ribs, which include the 8th to 10th pairs, do not connect directly to the sternum; instead, their cartilages fuse with the cartilage of the rib above them, forming an indirect connection to the sternum. This structural characteristic plays a significant role in the flexibility and expansion of the thoracic cavity during breathing.

In contrast, while the false ribs are indeed connected to the spine, this does not differentiate them significantly from true ribs, which are connected to the spine as well. False ribs are also not primarily known for providing structural support to the chest in the same way true ribs do; thus, the assertion about them serving as the main structural support does not hold, as this role is primarily fulfilled by the true ribs. Lastly, false ribs are not necessarily shorter than true ribs, as rib lengths can vary significantly among individuals and among different rib types. The defining characteristic remains