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  4. How many ribs in humans are attached only to the vertebral column?

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Q. How many ribs in humans are attached only to the vertebral column?

NTA AbhyasNTA Abhyas 2020

Solution:

There are 12 pairs of ribs. Each rib is a thin, flat bone connected dorsally to the vertebral column and ventrally to the sternum. It has two articulation surfaces on its dorsal end and is hence called bicephalic. The first seven pairs of ribs are called true ribs. Dorsally, they are attached to the thoracic vertebrae and ventrally connected to the sternum with the help of hyaline cartilage. The 8th, 9th and 10th pairs of ribs do not articulate directly with the sternum, but join the 7th rib with the help of hyaline cartilage. These are called vertebrochondral (false) ribs. Last 2 pairs (11th and 12th) of ribs are not connected ventrally and are therefore, called floating ribs. .