Fig. 4. Dissection of anterior abdominal wall demonstrating the rectus abdominis muscle, transversus abdominis (TA), and posterior layer of rectus sheath (A, B). Measurements were taken at (a) xiphisternum, (b) midway between xiphisternum and umbilicus, (c) umbilicus, (d) arcuate line, and (e) midway between arcuate line and pubic symphysis. Dotted line indicates linea alba. Note that the TA completely exits the posterior rectus sheath at the level of umbilicus.
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