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The 11th and 12th ribs are classified as floating ribs, meaning they do not attach to the sternum or have a direct connection to the rib cage. Unlike the true ribs, which connect to the sternum via costal cartilages, these floating ribs have only a posterior attachment to the vertebrae and end in the muscle of the abdominal wall. This anatomical feature allows for greater mobility and flexibility in the lower thoracic area, providing protection to the underlying organs while accommodating respiratory movements.

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1mo ago

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