Parietal

Adjective from the Latin “parietalis” meaning “belonging to the wall” that the ancient anatomists used to designate the wall, as of a body cavity.

For examples, there are the:

• Parietal bone — the main side bone of the skull.
• Parietal lobe — the main side lobe of the brain (it is beneath the parietal bone).
• Parietal pericardium — the outer membrane around the heart.
• Parietal peritoneum — the membrane lining the abdominal cavity (as opposed to the visceral peritoneum that envelops the abdominal organs).