In the main system the abdominal area is projected on the palm and foot.  The position of the diaphragm on the palm coincides with the skin flap at the wrist’s bottom. On the foot, it coincides with the contour, outlining the back side of the heel, looked from below.

In the “Insect” system the abdominal area coincides with the inner part of the proximal (third) phalanges of all fingers and toes (without the thumbs).  On the thumbs the abdominal area is projected on the first bone before the wrist and the first bone before the foot. Here the abdominal area is “stratified” and coincides exactly with the correspondence zone of the thorax according to the Main correspondence system (see below image).