Question

Which germ layer gives rise to epithelial tissue?

Answer 1

Germ layers:

1. A group of cells in an embryo is known as the germ layer.
2. These layers associate with each other as the development of the embryo takes place and will finally give rise to all the organs and tissues of an organism.
3. It is any of the three primary cell layers produced in the initial stages of embryonic development, comprising the ectoderm (outer layer), the endoderm (inner layer), and the mesoderm (middle layer).
4. The epidermis or the outer layer of the skin and the lining of all the hollow cavities of the organs is known as the epithelial tissue.
5. The epithelial tissue is derived from either the endoderm or ectoderm.
6. The endodermal-derived epithelial tissue comprises the digestive tract’s epithelial lining, the lining of all the hollow compositions produced as outpockets in the digestive tract.
7. On the other hand, the epithelial tissue derived from the ectoderm is generally the squamous epithelium.
8. Squamous epithelium is found in the esophagus, mouth, in the lining of blood vessels, alveoli sacs, nose, and as a coating external to the tongue and skin.
9. Thus, epithelial tissues are derived from endoderm and ectoderm.