NEET PG DENTAL EXAM

HISTOLOGY

INTEGUMENTARY SYSTEM SKIN

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
Which is the innermost layer of the epidermis?
A
stratum corneum
B
Stratum basale
C
stratum spinosum
D
stratum granulosum
Explanation: 

Detailed explanation-1: -Stratum basale, also known as stratum germinativum, is the deepest layer, separated from the dermis by the basement membrane (basal lamina) and attached to the basement membrane by hemidesmosomes.

Detailed explanation-2: -The stratum corneum is the outer layer of the skin (epidermis). It serves as the primary barrier between the body and the environment. The epidermis is made up of five layers: stratum basale: the deepest layer of epidermis, made up of cuboidal and columnar cells.

Detailed explanation-3: -The innermost basal layer, stratum basale (SB), consists in undifferentiated keratinocytes, stem cells, melanocytes, and Merkel cells. On top of this layer resides the spinous layer, stratum spinosum (SS). The subsequent granular layer, stratum granulosum (SG), consists of 3–5 cell layers.

Detailed explanation-4: -The basal cell layer (stratum basale, or stratum germinosum), is a single layer of cells, closest to the dermis. It is usually only in this layer that cells divide. Some of the dividing cells move up to the next layer. The prickle cell layer (stratum spinosum) is the next layer (8-10 layers of cells).

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