part_of part of part of connects connects anal canal proctodeum hindgut pectinate line http://upload.wikimedia.org/wikipedia/commons/7/7b/Hemorrhoid.png Wikipedia:Pectinate_line site of anal membrane UMLS:C0821671 linea anocutanea UBERON:0006574 FMA also has FMA:29321 but it's not clear how this differs pectinate line of anal canal The pectinate line (anocutaneous line, dentate line, anorectal junction) is a line which divides the upper 2/3rds and lower 1/3rd of the anal canal. Developmentally, this line represents the hindgut-proctodeum junction. It is an important anatomical landmark, and several distinctions can be made based upon the location of a structure relative to this line:. NCIT:C34245 dentate line FMA:75383 linea pectinata canalis analis uberon Hilton's 'white line' EMAPA:19159 recto-anal junction SCTID:245445008 anatomical junction intestinal junction