Simple columnar epithelium of the digestive tract is characterized by a single layer of tall, slender cells that are arranged in a column-like pattern. These cells are typically joined together by tight junctions, which help to form a barrier to the passage of substances between cells. The cells also contain numerous microvilli, which increase the surface area of the cells and help to absorb nutrients. In addition, the cells contain many mitochondria and other organelles that are involved in the digestion and absorption of nutrients.

Simple columnar epithelium

Tissue type
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Simple columnar epithelium
Normal gastric mucosa intermed mag.jpg

The stomach wall, with simple columnar epithelium visible as a lining at the top.
Details
Identifiers
Latin simple columnar epithelium
TH H2.00.02.0.02020
FMA 45567
Anatomical terminology

This article is part of a series on
Epithelia
Squamous epithelial cell
Columnar epithelial cell
Cuboidal epithelial cell
Specialised epithelia
Other

Simple columnar epithelium is a single layer of columnar epithelial cells which are tall and slender with oval-shaped nuclei located in the basal region, attached to the basement membrane. In humans, simple columnar epithelium lines most organs of the digestive tract including the stomach, and intestines. Simple columnar epithelium also lines the uterus.

Structure

Simple columnar epithelium is further divided into two categories: ciliated and non-ciliated (glandular). The ciliated part of the simple columnar epithelium has tiny hairs which help move mucus and other substances up the respiratory tract.

The shape of the simple columnar epithelium cells are tall and narrow giving a column like appearance. the apical surfaces of the tissue face the lumen of organs while the basal side faces the basement membrane. the nuclei are located closer along the basal side of the cell.

Absorptive columnar epithelium is characterized as having a striated boarder on its apical side, this border is made up of non-motile microvilli allowing for increase surface area for absorption. these are known as ciliated columnar epithelium.

Simple Columnar Epithelium is made up of Glandular Goblet cells which secrete mucins to form mucin. the rest of the cell is made up of cytoplasm with membrane bound secretory granules which secrete the mucin, and are found towards the apical surface of the cell.

Ciliated

Ciliated columnar epithelium has many cilia which moves mucus and other substances via mucociliary clearance in the respiratory tract.

It is present in the lining of the fallopian tubes, where currents generated by the cilia propel the egg cell toward the uterus.

Ciliated columnar epithelium forms the neuroepithelium of the ependyma that lines the ventricles of the brain and central canal of the spinal cord. These cilia move the cerebro-spinal fluid (CSF).

Non-ciliated

These are found in the lining sections of the gastrointestinal tract (inner lining of oesophagus, stomach, etc.) and may be brush bordered.

Function

  • Secretion
  • Absorption
  • Protection

References

External links


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