GROSS ANATOMY
THORACIC CAGE
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Each articulates with the thoracic vertebrae and directly to sternum with their own costal cartilage
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Each articulates with the thoracic vertebrae and binds indirectly to sternum by sharing costal cartilage
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Each articulates with the thoracic vertebrae, but do not connect to the sternum
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They do not connect to the sternum or the vertebrae
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Detailed explanation-1: -However, the floating ribs are the ribs that do not articulate with the sternum at all; they are the distal two ribs. The true ribs articulate with the sternum by the sternocostal joints. The first rib is an exception to that rule; it is a synarthrosis.
Detailed explanation-2: -The last two sets of ribs may not connect at all to the sternum at the very edge of the rib cage. Since their only connection is located at the back of the rib cage, fixed to the vertebrae of the spine, such ribs are known as ‘floating ribs’.
Detailed explanation-3: -There are two pairs of floating ribs and they are the most inferior of the ribs. They are different from the other ribs of the thoracic region because they do not articulate anteriorly with the sternum or the costal cartilage of other ribs.
Detailed explanation-4: -The 8th, 9th, and 10th pairs of ribs are called the false ribs as they do not articulate directly with the sternum. Rather, they join the seventh rib through the hyaline cartilage.
Detailed explanation-5: -The sternum is not attached to the last two pairs of ribs at the bottom of the rib cage. These ribs are known as “floating ribs” because their only attachment is at the rear of the rib cage, where they are connected to the spine’s vertebrae. Floating ribs are the 11th and 12th pairs of ribs.