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Concept
Stratified columnar epithelium
Summary
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.
Stratified columnar epithelia are found in a variety of locations, including:
parts of the conjunctiva of the eye
parts of the pharynx
anus
male urethra and vas deferens
excretory duct of mammary gland and major salivary glands
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. By 17 weeks, it is replaced by simple columnar epithelium. This is also found in the fetal esophagus.
The cells function in secretion and protection.
Official source
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