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(Redirected from Dentate line)
Line dividing the upper two-thirds and the lower third of the anal canal
Not to be confused with Pectineal line (pubis).
Pectinate line
Pectinate line labeled at bottom center
The interior of the anal cami and lower part of the rectum, showing the columns of Morgagni and the anal valves between their lower ends. (Pectinate line visible but not labeled.)
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.
It is an important anatomical landmark in humans, and forms the boundary between the anal canal and the rectum according to the anatomic definition. Colorectal surgeons instead define the anal canal as the zone from the anal verge to the anorectal ring (palpable structure formed by the external anal sphincter and the puborectalis muscle). Several distinctions can be made based upon the location of a structure relative to the pectinate line:
Microscopic cross section of the anorectal junction
Anatomy of the anus and rectum
Coronal section of rectum and anal canal
References
^ Lee, JM; Kim, NK (April 2018). "Essential Anatomy of the Anorectum for Colorectal Surgeons Focused on the Gross Anatomy and Histologic Findings". Annals of coloproctology. 34 (2): 59–71. doi:10.3393/ac.2017.12.15. PMID29742860.
MD, Tao Le, MD, MHS, Vikas Bhushan, MD, Matthew Sochat, MD (2017). First aid for the USMLE step 1 2017 : a student-to-student guide. ISBN978-0071831420.{{cite book}}: CS1 maint: multiple names: authors list (link)
Schoenwolf, Gary C.; Bleyl, Steven B.; Brauer, Philip R.; Francis-West, Philippa H. (2014-12-01). Larsen's Human Embryology. Elsevier Health Sciences. p. 372. ISBN9781455727919.
External links
pelvis at The Anatomy Lesson by Wesley Norman (Georgetown University) (rectum)
Pectinate line labeled at bottom center
The interior of the anal cami and lower part of the rectum, showing the columns of Morgagni and the anal valves between their lower ends. (Pectinate line visible but not labeled.)
Microscopic cross section of the anorectal junction
Anatomy of the anus and rectum
Coronal section of rectum and anal canal
