Simple columnar epithelium
|Simple columnar epithelium|
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|Squamous epithelial cell|
|Columnar epithelial cell|
|Cuboidal epithelial cell|
A simple columnar epithelium is a columnar epithelium that is uni-layered. In humans, a simple columnar epithelium lines most organs of the digestive tract including the stomach, small intestine, and large intestine. Simple columnar epithelia line the uterus.
Simple columnar epithelium is further divided into two categories: ciliated and non-ciliated.
They are found in the respiratory tract. Due to the movement of the cilia, the mucous and air is pushed away to clear the respiratory tract.
Ciliated columnar epithelium moves mucus and other substances via cilia and is found in the upper respiratory tract, the Fallopian tubes, the uterus, and the central part of the spinal cord.They are the primary target of infection for "common cold viruses" such as coronaviruses, influenza virus and rhinoviruses. These viruses may kill the ciliated cells or stop the cilia beating. In either case, mucus builds up and forms a good site for secondary bacterial infections, resulting in mucus.
Transverse section of a villus, from the human intestine. X 350.
a. Basement membrane, here somewhat shrunken away from the epithelium.
c. Columnar epithelium.
d. Its striated border.
e. Goblet cells.
f. Leucocytes in epithelium.
f’. Leucocytes below epithelium.
h. Muscle cells cut across.