True ribs
Pairs of ribs.
hyaline cartilage... that's the 10 pairs. not sure on the first eight pairs
Lower most two pairs of ribs (11th and 12th) are known as floating ribs because they are only attached to vertebrae but not to the sternum.
It is called the Sternum.
the first seven pairs are the only true ribs, because they attach anteriorly to the sternum. unlike the last five whose cartilage combines before the sternum, which makes them false ribs.
Rib pairs 10-12 do not connect to the sternum and they are called floating ribs.
True ribs, because 7-pairs of costal cartilages join 7-pairs of ribs DIRECTLY to the sternum. False ribs, because the costal cartilage join 3-pairs of ribs to the seventh-rib not the sternum. Floating ribs, because the last 2-pairs of ribs neither connects to a costal cartilage and the sternum.
True ribs attach with the cartilage that is a direct bridge to the sternum; they are called true ribs or vertebro-sternal ribs The false ribs just attach to cartilage that bind into one link or bridge that connects with the sternum (almost looks like a little web)
According to Ross and Wilson Anatomy and Physiology, 2 pairs
Body
there are seven pairs of ribs that are comlpetely attached bonetobone and there are three pairs that are attached wiht cartilage. the last remaining"floating" ribs are not attached. All the ribs are atached to the spine.
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.