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Serous membranes
Thin membranes in ventral cavities that reduce friction around moving organs.
Parietal vs Visceral serous layer
lines body wall; directly covers organ.
Serous cavity and fluid
Space between parietal and visceral layers containing lubricating ______ fluid.
Pericardium
Serous membrane of heart; parietal layer lines sac, visceral layer covers heart.
Pleura
Serous membrane of lungs, parietal ? lines thoracic wall, visceral ? covers lungs.
Peritoneum
Serous membrane of abdominopelvic cavity; parietal lines wall, visceral covers most organs.
Four abdominopelvic quadrants
RUQ, LUQ, RLQ, LLQ; divided around the umbilicus.
Nine abdominopelvic regions
Right hypochondriac, Epigastric, Left hypochondriac / Right lumbar, Umbilical, Left lumbar / Right iliac, Hypogastric, Left iliac.

Top row of 9 regions
Right hypochondriac → Epigastric → Left hypochondriac.
Middle row of 9 regions
Right lumbar → Umbilical → Left lumbar.
Bottom row of 9 regions
Right iliac → Hypogastric → Left iliac.
Alternative region names
Hypogastric = pubic/suprapubic; Lumbar = lateral/flank; Iliac = inguinal.
Lower-right abdominal pain
RLQ quadrant and right iliac region.