Question

Select the correct option regarding ribs.

• A. There are seven pairs of vertebrosternal, three pairs of vertebrochondral and two pairs of vertebral ribs.
• B. 8th, 9th and 10th pairs of ribs articulate directly with the sternum.
• C. The 11th and 12th pairs of ribs are connected to the sternum with the help of hyaline cartilage.
• D. Each rib is a flat thin bone and all the ribs are connected dorsally to the thoracic vertebrae and ventrally to the sternum.

Answer 1

The correct option is A

There are seven pairs of vertebrosternal, three pairs of vertebrochondral and two pairs of vertebral ribs.

The correct option is A.

Explanation of the correct option:

1. There appear to be twelve pairs of ribs, with the vertebral column illuminating both.
2. The sternum has a simple articulation at seven.
3. As a result, ribs can be classified into three types: true (vertebrosternal) ribs, false (vertebrochondral) ribs, and floating (vertebral, free) ribs.
4. True ribs are those that have one to seven ribs and are connected to the sternum via their own costal cartilage.
5. The ribs that connect the manubrium and sternum to the thoracic vertebrae are known as vertebrosternal ribs.
6. Ribs 2 through 6 or 7 are included.
7. Vertebrochondral is bound to vertebrae with costal cartilage of other ribs from one end to the other; vertebrocostal, but not vertebrosternal.

Explanation of the incorrect options:

Option B:

1. The eighth, ninth, and tenth pairs of ribs do not articulate directly with the sternum, but rather join the seventh ribs via hyaline cartilage.
2. These are vertebrochondral ribs, also known as false ribs.

Option C:

The last 22 pairs of ribs, the 11th, and 12th are not connected ventrally and are thus referred to as floating ribs.

Option D:

The sternum is only ventrally connected to the first seven pairs of ribs.

Final answer: There are seven pairs of vertebrosternal, three pairs of vertebrochondral and two pairs of vertebral ribs.