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Related to costal arch: Left Costal Margin
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The contents commonly include pre-peritoneal fat, omentum, bowel & occasionally organs Adriaan Van Den Spieghel (1578--1625), Professor of Surgery and Anatomy at Padua first described the semilunar line which marks the transition from muscle to aponeurosis in the transverse abdominis muscle and stretches from the costal arch to the pubic tubercle.
The skin and tissues of the abdomen from the costal arch to the pubes were removed in three large flaps.
Abdominal hernias may occur when the abdominal wall is severely traumatized and which may be high or low in flank, along the costal arch or between the last few ribs (Keown, 1974).