The abdomen, which is the part between the pelvis and the chest. In the middle of the abdomen, from the glabella down to the pubic symphysis is the white line, and at the midpoint of the white line there is the belly button. In order to facilitate the description of the location of abdominal organs, abdominal symptoms and signs, the abdomen is artificially divided into several regions.1. Nine-zone division method: the upper horizontal line is the subcostal plane, the lower horizontal line is the line of the left and right lateral anterior superior iliac spine, the left and right lateral longitudinal line, and the midline of the clavicle on both sides, dividing the abdomen into: left and right upper abdomen, left and right lumbar region, left and right lower abdomen, upper abdomen, middle abdomen and lower abdomen.2, Four-zone division method: The abdomen was divided into four zones: left upper abdomen, left lower abdomen, right upper abdomen and right lower abdomen by the front median line and umbilical level line.