<prompt> Not true about the anal canal is -Completely lined by stratified squamous epitheliumSupplied by pudendal nerveDrained by veins forming portosystemic anastomosisPart below pectinate line is supplied by inferior rectal artery  <response>: The anal canal is not completely lined by squamous epithelium. The part above pectinate line is lined by simple columnar epithelium, the part between pectinate and Hiltons white line is lined by non-keratinized stratified squamous epithelium, and the part below Hiltons line is lined by true skin stratified keratinized squamous epithelium.The lower part of the anal canal is supplied by pudendal nerve and is supplied by the inferior rectal artery.The anal canal is a site of the portosystemic anastomosis. 