What are epithelial cells
Epithelial cells are closely packed cells that form sheets, and are at the ends of tissues.
They have the characteristic of having great cohesion between them, which is called epithelium. These epithelial cells have structures that help attach the cytoskeletons of each individual cell to each other, while at the same time anchoring it to the extracellular matrix so that it does not move around.
They are found on the surfaces of organs, glands, cavities or ducts, always in the outermost part and moving inward.
These cells have a polar structure, where an apical or upper pole is distinguished, which is the external part, and a lower basal pole, where they are held by a membrane or basal lamina.
The cellular epithelium can be found in a single layer, or made up of several layers of cells.
In epithelial tissue there are no blood vessels, and there is a constant turnover of cells to produce new cells and eliminate old ones.
Under the epithelial cell is the basal lamina, and the fibroreticular lamina.