Question Detail
Question
The last two pairs of ribs that remain free and are NOT attached to the sternum are called:
Correct Answer
Option C is the correct answer.
Detailed Explanation
The last two pairs of ribs (ribs 11 and 12) remain free and are known as floating ribs. They are attached only to the thoracic vertebrae posteriorly and have no anterior attachment, allowing for flexibility.
Hint
These ribs have no anterior attachment to the sternum.