![]() Medically reviewed by Healthline’s Medical Network on March 19, 2015. This is achieved with the help of the anal sphincters and the neighbouring puborectalis muscle. The dentate (pectinate) line divides the anal anal into upper (two-thirds) and lower (one-third) parts, each one being supplied by completely different neurovascular structures. Developmentally, this line represents the hindgut-proctodeum junction. Where is the Pectinate line?Īnatomical terminology The pectinate line (dentate line) is a line which divides the upper two-thirds and lower third of the anal canal. Thus, you do not normally see or feel these hemorrhoids until they become swollen and start to bleed. Internal hemorrhoids are the hemorrhoids in the anal canal above the “pectinate line”, also known as the “pain line” because below this area you feel pain. The line between the simple columnar epithelium of the rectum and the stratified epithelium of the anal canal. Below the anocutaneous line, lymphatic drainage is to the superficial inguinal nodes. ![]() The anal canal is completely extraperitoneal.Īnatomical terminology The anocutaneous line, also called the Hilton white line or intersphincteric groove, is a boundary in the anal canal. The demarcation between the rectum above and the anal canal below is the anorectal ring or anorectal flexure, where the puborectalis muscle forms a sling around the posterior aspect of the anorectal junction, kinking it anteriorly. The internal anal sphincter (IAS), external anal sphincter and puborectalis muscle constitute the surgical anal canal. The anorectal ring consists of the external anal sphincter and the puborectalis muscles and is a good landmark for locating the tumor or the level of the colorectal anastomosis. 6 What is the function of the rectum in the colon?.5 What is the final segment of the rectum called?.
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