Floating ribs the 11th. and 12th. ribs
The transversus abdominis.
Only the true ribs are attached to the sternum the false ribs (3) and the floating ribs (2) are not directly attached. The flalse ribs are attached indirectly via cartillage and the floating ribs are not attached at all.
There are 7 pairs of true ribs. They are the 1st through 7th ribs. There are 5 pairs of false ribs, the 8th to the 12th ribs.
Floating ribs are a type of false ribs. False ribs are ribs that do not directly attach to the sternum through cartilage, and they include both floating ribs (ribs 11-12) and ribs 8-10, which are attached to the sternum indirectly through cartilage.
cats have 20 small ribs. i know this because i counted my cats ribs.
Ribs 11 and 12 are known as floating ribs because they do not attach to the sternum in front, only connecting to the vertebrae in the back. They are shorter and more flexible than other ribs.
External intercostal
quadratus lumborum
True ribs (ribs 1-7) articulate with the vertebral column at the thoracic vertebrae and also attach directly to the sternum at the front of the chest through costal cartilage. This connection provides structural support and protection for the internal organs located in the chest cavity.
The rib pairs that attach to the back vertebrae but are not connected to the sternum are known as floating ribs. In human anatomy, the 11th and 12th rib pairs are termed floating ribs. There are 12 pairs of ribs. The floating ribs are the lowest two rib pairs that are also called false ribs.
The ribs lower during exhalation. During forced exhalation, the quadratus lumborum muscle stabilizes the 12th rib while the internal intercostal muscles and transverse thoracic muscle pull the ribs downward forcefully to decrease the volume of the thorax.