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CHAPTER 14 - GASTROINTESTINAL TRACT
Histology Guide
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MICROSCOPE SLIDE

SLIDE NAME
MHS 258 Recto-Anal Junction
TISSUE
Junction between Rectum
and Anus
STAIN
Hematoxylin & Eosin
IMAGE SIZE
51,740 x 26,700 pixels
5.1 GB
FILE SIZE
304 MB
OBJECTIVE
40x
PIXEL SIZE
0.3171 µm
SOURCE
T. Clark Brelje and Robert L. Sorenson
Department of Genetics, Cell Biology, and Development
School of Medicine
University of Minnesota
Minneapolis, MN

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Robert L. Sorenson, Ph.D.

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University of Minnesota
Department of Genetics, Cell Biology and Development
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321 Church St SE
Minneapolis, MN 55455

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MHS 258 Recto-Anal Junction

Recto-Anal Junction

The anal canal is the site where there is a transition from the simple columnar epithelium of the colon to the stratified squamous epithelium of skin (the pectinate line).

  • - left side of the specimen.
    • - secrete mucus into the anal canal.
      • Absorptive Cells (or Enterocytes) - simple columnar cells with microvilli (or brush border).
      • Goblet Cells - very abundant and secrete mucus.
    • - is an expansion of the inner circular layer of the muscularis externa.
  • (Anal Transition Zone) - junction between the simple columnar epithelium of the colon and the stratified squamous epithelium of the skin (). At first it is not keratinized, but within a few millimeters it becomes keratinized.
  • - right side of the specimen.
    • - initially is non-keratinized but becomes keratinized within a few millimeters.
    • - skeletal muscle that is part of the pelvic floor.
    • - are apocrine glands.
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