Which plane would divide the upper abdominopelvic quadrants from the lower abdominopelvic quadrants?

The plane that divides the upper abdominopelvic quadrants from the lower abdominopelvic quadrants is the transumbilical plane. This horizontal plane runs through the umbilicus (navel) and is situated at the level of the L3-L4 vertebrae. It separates the quadrants into the right and left upper quadrants above and the right and left lower quadrants below.