Any of four topographic areas of the abdomen divided by two imaginary lines, one vertical and one horizontal, intersecting at the umbilicus, or belly button. as determined from the front of the body.

The divisions are the left upper quadrant (LUQ), the left lower quadrant (LLQ), the right upper quadrant (RUQ), and the right lower quadrant (RLQ).

• Left upper quadrant (LUQ): left lobe of liver, stomach, transverse colon, splenic flexure, pancreas, left kidney, and spleen.
• Left lower quadrant (LLQ): small intesine, left ureter, sigmoid flexure, descending colon, bladder if distended, left spermatic duct in the male; left ovary and left tube, and uterus if enlarged, in the female.
• Richt upper quadrant (RUQ): right lobe of the liver, gallbladder, part of transverse colon, part of pylorus, hepatic flexure, right kidney, and duodenum.
• Right lower quadrant (RLQ): cecum, ascending colon, small intestine, appendix, bladder if distended, right ureter, right spermatic duct in the male; right ovary and right tube, and uterus if enlarged, in the female.