The lesser abdomen is the abdomen below the level of the navel, or the abdomen below the level of the anterior superior iliac spine. In order to describe the parts of the abdominal organs, it is necessary to partition the abdomen, which can be taken into four divisions, with the navel as the center of the horizontal and vertical lines, the abdomen can be divided into the left upper abdomen, the left lower abdomen, the right upper abdomen, the right lower abdomen, and the lesser abdomen means the left lower abdomen and the right lower abdomen, which are located below the level of the navel. When partitioning the abdomen, you can also take the nine-point method, this division has two horizontal lines, the upper horizontal line for the two sides of the lowest point of the ribcage line, the lower horizontal line for the two sides of the anterior superior iliac spine of the line, will be below the level of the anterior superior iliac spine of the abdomen is called a small abdomen.