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What Is a Stratified Columnar Epithelium?
It is a rarely found column-shaped epithelium, located on the conjunctiva, lobar ducts, anus, pharynx, etc. Stratified columnar epithelium is made up of multiple layers of epithelial cells. Often, it can be found between squamous epithelia and simple columnar epithelia.
It has multiple layers of cells wherein the apical layer is composed of columnar cells and the deeper layer can be columnar or cuboidal.
The stratified columnar epithelial tissues are uncommon when compared to other epithelial tissues. It can be found in the following locations of a human body:
- Conjunctiva
- Male urethra
- Anus
- Pharynx
Functions of Stratified Columnar Epithelium
The function of stratified columnar epithelium is mainly the protection of underlying tissues with multiple layers of epithelial cells. Also, they perform secretion.
Protection
- The multiple layers of epithelium protect the tissues and organs from physical and microbial damages.
- Acts as a protection of conjunctiva and delicate part of the eyes.
- Filters out the toxins and allows entry of nutrients inside the cells.
- Creates the first line of defence in the body because of continuous repair and replacement of the cells.
Secretion
- It secretes the waste materials into ducts or out of the body. These are done by the stratified columnar epithelium present in the glands and excretory system.
- Columnar epithelium of the eyes (present in the conjunctiva) retains the moisture of the eyes and keeps them clean. They do so by secreting mucus.
To get more information and to clear your doubts, you can visit our NEET section.
See more:
- Endocrine System
- List of Endocrine Glands and Functions
- Exocrine Glands
- Difference between Endocrine and Exocrine Glands
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