Final answer:
Floating ribs are rib pairs 11 and 12, which do not connect to the sternum or with the cartilage of other ribs and end in the lateral abdominal wall musculature.
Step-by-step explanation:
The floating ribs are rib pairs 11 and 12, which are also known as vertebral ribs. Unlike other ribs, these floating ribs do not attach to the sternum at all and also lack attachment to the costal cartilage of other ribs. Instead, they terminate within the musculature of the lateral abdominal wall, providing structural support while allowing flexible movement needed for breathing and other physical activities.
The false ribs are classified as ribs 8 through 12. However, it is specifically ribs 11 and 12 that are considered floating ribs, as they do not connect with the sternum which forms the characteristic 'floating' aspect in the thoracic cage.