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| Simple columnar epithelium | |
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| Vertical section of a villus from the dog’s small intestine. X 80. (Simple columnar epithelium labeled at right, third from top.) | |
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| Transverse section of a villus, from the human intestine. X 350. a. Basement membrane, here somewhat shrunken away from the epithelium. b. Lacteal. c. Columnar epithelium. d. Its striated border. e. Goblet cells. f. Leucocytes in epithelium. f’. Leucocytes below epithelium. g. Bloodvessels. h. Muscle cells cut across. |
A simple columnar epithelium is a columnar epithelium that is uni-layered. In humans, a simple columnar epithelium forms a lining in the uterus and in most organs of the digestive tract including the stomach, small intestine, and large intestine.
Simple columnar epithelia are further divided into two categories: nonciliated and ciliated.
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Nonciliated
Nonciliated columnar epithelia do not have cilia, and are found in the gastrointestinal tract and the gallbladder where they perform secretion and absorption.
~usually absorbs through the digestive system ~located in the stomach and intestines,gallbladder, and ecretory ducts of some glands. ~more function, more tissue, more cytoplasm ~ nucleus is closer to the basal surface ~ absorbs; seceretion of mucus enzymes and other substances; cillated type propels by cilary action.
Ciliated
Ciliated columnar epithelia move mucus and other substances via cilia, and are found in the upper respiratory tract, the Fallopian tubes, the uterus, and the central part of the spinal cord.
Ciliated columnar epithelium lines the lumen of the uterine tube, where currents generated by the cilia propel the egg cell toward the uterus.
Additional images
 Types of epithelium. |
 Histology of gallbladder. |
 Layers of stomach wall. |
 Vertical section of mucous membrane of human uterus. |
 lining of gallbladder |
References
External links
- Histology at KUMC epithel-epith05 "Gall bladder" - Simple columnar epithelium
- UIUC Histology Subject 1061 - Uterine tube lumen
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Wikipedia content modification information:
- This page was last modified on 25 September 2008, at 16:54.
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