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Related to abdominal regions: abdominal quadrants
topographic divisions of the abdomen, as bounded by the vertical midclavicular lines and the horizontal transpyloric and interspinous (transtubercular) lines (see illustration).
ab·dom·i·nal re·gions(ab-dom'i-năl rē'jŭnz) [TA]
The topographic subdivisions of the abdomen; based on subdividing the abdomen by the transpyloric, transtubercular, and midinguinal planes; including the right and left hypochondriac, right and left lateral, right and left inguinal, and the unpaired epigastric, umbilical, and pubic regions.
The abdomen and its external surface, divided into nine regions by four imaginary planes: two horizontal, one at the level of the ninth costal cartilage (or the lowest point of the costal arch) and the other at the level of the highest point of the iliac crest; two vertical, through the centers of the inguinal ligaments (or through the nipples or through the centers of the clavicles) or curved and coinciding with the lateral borders of the two abdominal rectus muscles.See: illustration
See also: region