NEET PG DENTAL EXAM

HISTOLOGY

INTEGUMENTARY SYSTEM SKIN

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
the layer of the epidermis that consists of only dead cells that have been replaced by keratin is the
A
stratum basale
B
stratum spinosum
C
stratum granulosum
D
stratum corneum
Explanation: 

Detailed explanation-1: -Stratum corneum, 20-30 cell layers, is the uppermost layer, made up of keratin and horny scales made up of dead keratinocytes, known as anucleate squamous cells. This is the layer which varies most in thickness, especially in callused skin.

Detailed explanation-2: -The stratum corneum, which is the outermost epidermal layer, consists of dead cells and is the major barrier to chemical transfer through the skin.

Detailed explanation-3: -Stratum Corneum The increased keratinization (also called cornification) of the cells in this layer gives it its name.

Detailed explanation-4: -The cells in the stratum corneum are dead because A. Epidermal cells die as they move away from their nutrient supply in the dermis. The blood/nutrient supply terminates in the dermis, so the further cells migrate from this blood supply, the less able they are to get nutrients in and waste products out.

There is 1 question to complete.