What do "visceral" and "parietal" mean?

Answer

In anatomy, a visceral membrane is the membrane covering a major organ, and the parietal membrane is a membrane lining the cavity in which the organ is located. This puts the parietal membrane outside the visceral membrane for any associated organ.

"Viscera" is a general term for the large organs of the abdomen, and "visceral" directly relates back to the organs. This term is also used to describe membranes around organs outside the abdomen, such as the brain. "Parietal" refers both to cavities and walls leading to its association with the linings of body cavities. Because organs rest snugly in their cavities, the parietal membrane often rests directly on the visceral membrane.

Reference:
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