Axiom. When you incise the abdominal wall, the direction of muscle fibers, the presence of areolar tissue, the presence of nerves and of branches of the deep circumflex iliac artery all indicate the depth at which you have arrived.
Surgical Anatomy. Arch Surg. 1996;131(6):666. doi:10.1001/archsurg.1996.01430180092019
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