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What is the muscle that extends across the rib cage

User Floriana
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A sheet of skeletal muscle extends across the ribcage and lies at the base of the thorax.

User JustBoo
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is a sheet of internal skeletal muscle[] that extends across the bottom of the rib cage. The diaphragm separates the thoracic cavity (heart, lungs & ribs) from the abdominal cavity.

Hope this helps!

User DasDave
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