What is skin? epidermis(4)

The skin has three layers. They are
epidermis, dermis and subcutaneous tissues
Epidermis
Stratum corneum
l
Outermost epidermis, it
is also called horny layer
l
Full of Corneocyte
which is dead keratinocyte
l
Visual barrier for
observation
Stratum lucidum
l
Clear layer, 3-5
layer, dead keratinocyte
l
Thickness depends on
the speed of cell division. The color is related to melanocyte.
l
Clear lay is more
obvious in thick skin. Because it contains a lot of eleidin which is premature
keratin.
l
The thickness of
Stratum corneum in lips is thinner, and it has a lot of eleidin. So the
appearance is red color.
Stratum granulosum/
granular layer
l
It is also called Granular
layer which has granular cells and keratohyalin granules
l
It is the transition
zone of Stratum corneum and starts to appear lamellar bodies. It also continues
to excrete lipid into gap of each cell.
Stratum spinosum/
spinous layer
l
Spinous lay or pricle
cell layer due to connection with desmosome.
l
The keratinized tissue is from this
layer
Stratum basale/ basal
layer
l
Stratum germinativum
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