Pectinate line

The pectinate line (dentate line) is a line which divides the upper two thirds and lower third of the anal canal. Developmentally, this line represents the hindgut-proctodeum junction.Microscopic cross section of the anorectal junction.Anatomy of the anus and rectumCoronal section of rectum and anal canal. The pectinate line (dentate line) is a line which divides the upper two thirds and lower third of the anal canal. Developmentally, this line represents the hindgut-proctodeum junction.