[Location] Localized in the supine position, on the anterior median line of the lower abdomen, 4 cun below the umbilicus. (Fig.74)
 
[Regional Anatomy] Skin→subcutaneous tissue→linea alba→transverse fascia→extraperitoneal fattissue→parietal peritoneum. Superficial layer, the distribution of the anterior cutaneous branches of the iliohypogastric nerve, the branches or the subordiantial ramus of the superficial epigastric artery and vein; deep layer, the branch of the iliohypogastric nerve.