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.

1. A mechanism for measuring electric current passing through a coil by the deflection of a magnetic needle inside the coil.
2. A device for measuring an electric charge by the movement of a vane suspended on a wire between metal quadrants.

The charge is introduced on the vane and quadrants in such a way that there is a proportional twist to the wire.

Blindness of the symmetrical quadrant (one fourth) of the field of vison in each eye.