Columnar
Columnar
Columnar (/kəˈlʌmnər/), derived from the Latin word 'columna' meaning 'pillar', is a term used in various fields of medicine to describe a specific type of cellular arrangement or structure.
Definition
In a medical context, columnar refers to cells that are taller than they are wide, resembling columns. These cells are typically found in various parts of the body, including the gastrointestinal tract, respiratory tract, and reproductive system.
Types of Columnar Cells
There are several types of columnar cells, each with their own unique characteristics and functions. These include:
- Simple Columnar Epithelium: This type of columnar cell is found in the lining of the stomach, intestines, and other parts of the digestive tract. They are involved in absorption and secretion processes.
- Pseudostratified Columnar Epithelium: These cells appear to be layered due to the varying lengths of their nuclei, but are in fact a single layer. They are commonly found in the respiratory tract.
- Stratified Columnar Epithelium: These cells are multi-layered and are found in certain glands and ducts, such as the male urethra and the eye's conjunctiva.
Related Terms
- Epithelium: The thin tissue that forms the outer layer of a body's surface and lines the alimentary canal and other hollow structures.
- Goblet Cell: A type of columnar cell that secretes mucus, found in the respiratory and intestinal tracts.
- Ciliated Columnar Epithelium: Columnar epithelial cells that have cilia on their surface, found in the respiratory tract and fallopian tubes.
See Also
External links
- Medical encyclopedia article on Columnar
- Wikipedia's article - Columnar
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