- Humans have 24 ribs (12 pairs). The second - seventh sets of ribs, known as "true ribs", are directly attached to the sternum through the costal cartilage.
- the first three (eighth, ninth, and tenth rib) have their cartilages attached to the cartilage of the rib above
- the last two (eleventh rib and twelfth rib) are free at their anterior extremities and are termed floating ribs or vertebral ribs because they connect neither with the sternum nor with another rib.
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