[Location] Localized in the supine position, on the middle of the abdomen. 2 cun lateral to the umbilicus. (Fig.45)
 
[Regional Anatomy] Skin→subcutaneous tissue→the prior of rectus abdominis' sheath→rectus abdominis. Superficial layer, the lateral and prior cutaneous branches of the prior branches of the ninth, tenth and eleventh thoracic nerves and the venous network around the umbilicus; deep layer, the anastomotic branch of the superior epigastric and inferior epigastric arteries and veins, the muscular branches of the prior branches of the ninth, tenth and eleventh thoracic nerves.