MEDICAL
THORACIC WALL
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Costal Cartilage
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Vertebrosternal ("True") ribs
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Vertebrochondral ("False") Ribs
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Vertebral ("Floating") Ribs
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Detailed explanation-1: -The false ribs (8, 9, 10) are the ribs that indirectly articulate with the sternum, as their costal cartilages connect with the seventh costal cartilag by the costochondral joint. The floating ribs (11, 12) do not articulate with the sternum at all (distal two ribs).
Detailed explanation-2: -The eleventh and twelfth don’t have any articulations anteriorly and are free. Their only attachment is posteriorly, to the eleventh and twelfth thoracic vertebrae. As these ribs aren’t fixed anteriorly, they seem to float and are called floating ribs.
Detailed explanation-3: -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.