EZ 4 U 2 SAY: The lining of the abdominal cavity (peritoneum), lungs (pleura), and heart (pericardium) are all innervated with many nerve fibers. Therefore, anything that irritates these linings can cause severe pain. In contrat, many of the organs that reside in these cavities have very few pain fibers; the nerves are more responsible for organ function.
Answered 10/17/2018
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