Question

The various of epithelium are classified by

Answer 1

Classification of epithelial tissue based on course of action of cells

I. Simple epithelium:

Cells are found in a solitary layer connected to the cellar film.

ii. Compound or Stratified epithelium:

Cells are found in at least 2 layers stacked on one another.

iii. Pseudo-stratified epithelium:

Pseudo-stratified epithelium has all the earmarks of being more than one cell thick since the nuclei lie at various height yet in reality it is single layer of cells, in contact with the basement membrane

iv. Transitional epithelium:

cells are rounded and can slide crosswise over each other to permit stretching

2. Classification of epithelial tissue based on shape

I. Squamous epithelium: (Latin, squama-scale)

They are flat and thin , scale-like cells,

eg. Endothelium, mesothelium, pericardium, peritonium

ii. Cuboidal epithelium:

cells that have a fundamental cube shape.

Ordinarily the cell's height and width are about equivalent.

Eg. Kidney tubules, thyroid organs, conduit of perspiration organ

iii. Columnar epithelium:

They are tall, rectangular or column cells.

Commonly cells are longer than width.

Eg. Intestinal coating, nerve bladder, channels of organs

Epithelium cells cover whole body surface and organs and is protective in nature

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