Ribs 8- 12 are considered false ribs because they do not directly attach to the sternum by their own cartilage.Instead,the costal cartilage of ribs 8- 10 attach to the cartilage of the seventh rib.

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Ribs 8-12 are indeed considered false ribs because their costal cartilages do not attach directly to the sternum. Instead, the costal cartilage of ribs 8-10 attach to the cartilage of the seventh rib, while the cartilage of ribs 11 and 12 do not attach to the sternum at all.

Ribs 8- 12 Are Considered False Ribs Because They Do