The liver receives blood from the hepatic artery and portal vein; it then drains from the liver via the hepatic vein into the IVC.

33a. T 33b. T 33c. F 33d. F The anal canal superior to the pectinate line differs from the inferior part in its arterial supply, innervation, and venous and lymphatic drainage as a result of its embryonic origins. The region superior to the dentate line is insensitive to pain, because it is supplied by autonomic nerves, whereas inferior to the dentate line the region is very sensitive to pain because it is supplied by the

1 . A n a to m y : A n sw

e rs

part of the urethra results in a high riding prostate.