GENERAL HISTOLOGY

Detailed explanation-1: -Epidermis. The epidermis is the outermost layer of the skin, the layer of skin which is visible. The epidermis is also the thinnest of the three skin layers. It is an avascular skin layer, so it does not contain blood vessels.

Detailed explanation-2: -The dermis is a highly vascularized tissue, while the epidermis – – like any other type of epithelial tissue – – is avascular.

Detailed explanation-3: -Epithelial layers contain no blood vessels (avascular), so they must receive nourishment via diffusion of substances from the underlying connective tissue, through the basement membrane. Cell junctions are especially abundant in epithelial tissues.

Detailed explanation-4: -The epidermis is avascular – it has no blood vessels directly in the layer. Veins and arteries are found just deep to the epidermis. Nutrients and oxygen diffuse into this layer from the bloodstream.