EVERYDAY SCIENCE

Detailed explanation-1: -Dermal scales are found almost exclusively in fishes and some reptiles. They are bony plates that fit closely together or overlap and form the dermal skeleton. Highly developed dermal scales are seen in turtles, where the bony plates form a rigid dermal skeleton that is attached to the true skeleton.

Detailed explanation-2: -The scales of fish lie in pockets in the dermis and are embeded in connective tissue. Scales do not stick out of a fish but are covered by the Epithelial layer Epithelial layer.

Detailed explanation-3: -A fish scale is a small rigid plate that grows out of the skin of a fish. The skin of most jawed fishes is covered with these protective scales, which can also provide effective camouflage through the use of reflection and colouration, as well as possible hydrodynamic advantages.

Detailed explanation-4: -Dermal scales are small flat disks set in pockets in the transverse ridges of the skin. Each pocket contains several scales of various sizes. A ring of “hypomineralization” of varying diameter may occur on scales of a particular dermal pocket but bears no relation to the diameter of these scales.

Detailed explanation-5: -The outer layer is a thick epidermis, which is separated from the dermis by an acellular basement membrane. Principal epidermal cell types are epithelial cells, secretory granular cells, and modified uninucleate or binucleate cells called skein cells, which may play a role in epidermal tissue support.