There are four planes to define nine regions of the abdomen (Figure III-3-2).
The subcostal plane (horizontal) passes through the inferior margins of the 10th costal cartilages. Transtubercular Plane
The transtubercular plane (horizontal) passes through the iliac tubercles. Midclavicular Lines
The midclavicular lines (vertical) are the two planes that pass from the midpoint of the clavicle to the midpoint of the inguinal ligament on each side.
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