• The abdominopelvic cavity is subdivided into either four quadrants or nine regions as an aid in locating organs.
  • The four quadrants are right upper left upper right lower left lower
  • The nine regions are epigastric right flank left hypochondriac hypogastric (pubic) right hypochondriac left inguinal umbilical right inguinal left flank.

The abdominopelvic cavity is subdivided into either four quadrants or nine regions to aid health care providers in locating underlying organs in the abdominopelvic cavity. Physicians may feel (palpate) or listen to (auscultate) the abdominopelvic region to examine it. Changes in firmness or sounds may indicate abnormalities in the structures of a quadrant or region.

The four quadrants are formed by two planes that intersect just superior to the umbilicus (navel). The nine regions are formed by the intersection of two sagittal and two transverse planes. The sagittal planes extend inferiorly from the midpoints of the collarbones. The superior transverse plane lies just inferior to the borders of the 10th costal cartilages, and the inferior transverse plane lies just inferior to the superior border of the hip bones.