Has 12 pairs, attached posteriorly to thoracic vertebrae
Ribs
The first 7 pairs, attached anteriorly to the sternum
True ribs
The next 3 pairs, attached anteriorly to cartilage that connects them to the sternum
False ribs
The last two pairs, are not attached anteriorly. But are attached ONLY “posteriorly” to vertebrae.
Floating ribs