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Stratified columnar epithelium
Tissue type From Wikipedia, the free encyclopedia
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Stratified columnar epithelium is a rare type of epithelial tissue composed of column-shaped cells arranged in multiple layers. It is found in the conjunctiva, pharynx, anus, and male urethra. It also occurs in embryo.
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Location
Stratified columnar epithelia are found in a variety of locations, including:
- parts of the conjunctiva of the eye[1][2]
- parts of the pharynx[3]
- anus[3][4]
- male urethra and vas deferens[3][5]
- excretory duct of mammary gland and major salivary glands[6]
Embryology
Stratified columnar epithelium is initially present in parts of the gastrointestinal tract in utero, before being replaced with other types of epithelium. For example, by 8 weeks, it covers the lining of the stomach.[7][8] By 17 weeks, it is replaced by simple columnar epithelium.[7] This is also found in the fetal esophagus.[8]
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