What is difference between Floating and Fixed ribs
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Except in lamprey and frog, all other vertebrates have a rib cage. This is an arrangement of bones in the thorax. There are 12 pairs of ribs, out of which the top 7 pairs are attached to the vertebrae at the back and the sternum or breast bone in front; the next 3 pairs, i.e. the 8th to the 10th, are connected to the sternum indirectly via the costal cartilages of the ribs above them. The elasticity, thus created, allows ribcage movement that is necessary for respiratory activity. All these 10 pairs are called fixed ribs.
The lowest 2 pairs are floating ribs, a term used to describe them as they are attached to the vertebrae at the back but not to the sternum or the cartilage of the sternum in front. These last 2 pairs are relatively smaller in size and delicate in nature and include a cartilaginous tip.
The lowest 2 pairs are floating ribs, a term used to describe them as they are attached to the vertebrae at the back but not to the sternum or the cartilage of the sternum in front. These last 2 pairs are relatively smaller in size and delicate in nature and include a cartilaginous tip.
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