[Location] Localized in the supine position, in the middle of the abdomen, in the center of the umbilicus. (Fig.74)
 
[Regional Anatomy] Skin→connective tissue →parietal peritoneum. Superficial layer, the distribution of the anterior cutaneous branches of the anterior branches of the tenth thoracic nerve, and the periumbilical venous network on the abdominal wall; deep layer, the branch of the prior branches of the tenth thoracic nerve.