Layers of closely packed cells that are found covering or lining body surfaces, as in the __Epidermis_ of the skin, are called _Epithelium__ tissue.
Epitheliums are the cell layers that cover the body, different organs, bones, and other structures.
Epitheliums have their own shape, characteristics, and internal composition that make them unique and allow them to accomplish their functions. Their morphology correlates with their function.
There are two main types of epitheliums according to the number of cell layers,
• Simple epithelium
• Stratified epithelium
⇒ Simple epitheliums intervene in secretion or absorption processes.
Cells' height frequently reflects their secretor or absorptive activity degree.
Epitheliums that transport substances are characterized by presenting cubic or columnar cells.
⇒ The stratified epithelium is composed of several layers. The shape and size of the cells vary from one layer to the other.
Its general function is to provide a protective barrier in areas that are more exposed, and a certain degree of waterproofing.
Stratification correlates with transepithelial impermeability and friction exposure.
It protects against humidity loss and mechanical erosion.
The skin epidermis is a common example of stratified epithelium. It is composed of five cell layers, which have different functions:
Epitheliums also share many characteristics.
• They form cohesive layers, with cells very close to each other
• Scarse extracellular matrix
• Many union complexes join the cells
Cohesion between epithelial cells is possible by special adhesions that serve as anchoring of each cell's cytoskeleton and the extracellular matrix.
1) Epidermis
2) Epithelium
Layers of closely packed cells that are found covering or lining body surfaces, as in the __Epidermis_ of the skin, are called _Epithelium__ tissue.
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