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All of the following statements concerning the pectinate line are correct EXCEPT
The pectinate line indicates the junction of the superior part of the anal canal and the inferior part. The anal canal superior to the pectinate line differs from the part inferior to the pectinate line in its arterial supply, innervation, and venous and lymphatic drainage. The superior rectal artery supplies the superior part of the anal canal and the inferior rectal arteries supply the inferior part. Superior to the pectinate line, the internal rectal venous plexus drains chiefly into the superior rectal vein—a tributary of the inferior mesenteric vein and the portal system. Inferior to the pectinate line the internal rectal plexus drains into the inferior rectal veins—tributaries to the caval venous system. Superior to the pectinate line, the lymphatics drain into the internal iliac lymph nodes into the common iliac and lumbar nodes. Inferior to the pectinate line, the lymphatics drain into the superficial inguinal lymph nodes. Superior to the pectinate line, the innervation is visceral; inferior to the pectinate line, the innervation is somatic