About This File
There are twelve pairs of ribs which are separated by the intercostal spaces. The upper 7 ribs show increase on length progressively while the lower 5 ribs show gradual decrease in length.
- true: the first 7 ribs that attach to the sternum directly
- false: from 8th to 10th that attach to the sternum through costal cartilage
- floating: the 11th and 12th with no articulation to the sternum