The number of true, vertebrochondral and floating ribs are respectively

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7 pairs, 2 pairs and 3 pairs

6 pairs, 3 pairs and 3 pairs

7 pairs, 3 pairs and 2 pairs

8 pairs, 2 pairs and 2 pairs

answer is D.

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Detailed Solution

The number of true, vertebrochondral and floating ribs are 7 pairs, 3 pairs and 2 pairs respectively.

True Ribs (Vertebrosternal Ribs): There are 7 pairs of true ribs. True ribs are those that are directly connected to the sternum (breastbone) by their own costal cartilages.
Vertebrochondral Ribs (False Ribs): There are 3 pairs of vertebrochondral ribs. These ribs do not have a direct connection to the sternum but instead join the 7th rib via their own cartilages. The 8th, 9th, and 10th pairs of ribs are considered vertebrochondral or false ribs.
Floating Ribs (Free Ribs): There are 2 pairs of floating ribs. These are the 11th and 12th pairs of ribs, and they do not attach to the sternum or to the ribs above via cartilage. They are free at their anterior ends and are often attached only to the vertebrae and muscles.

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