Which of the following does NOT contribute to | vedclass

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Question

(A) The thoracic cage is a bony structure that protects the heart and lungs. It is composed of the $12$ pairs of ribs,the $12$ thoracic vertebrae,and

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Diaphragm

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(A) The thoracic cage is a bony structure that protects the heart and lungs. It is composed of the $12$ pairs of ribs,the $12$ thoracic vertebrae,and the sternum. The diaphragm is a muscular partition that separates the thoracic cavity from the abdominal cavity and is not a structural component of the thoracic cage itself. The pleura is a serous membrane that surrounds the lungs,not a part of the skeletal thoracic cage. However,among the given options,the diaphragm is a muscle,while the pleura is a membrane. In the context of skeletal anatomy,the diaphragm is the most distinct non-skeletal structure listed that does not form the cage. Given the standard options,the diaphragm is the primary answer as it forms the floor of the thoracic cavity rather than the cage itself.

Which of the following does $NOT$ contribute to the formation of the thoracic cage?

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