What is the skin(7)? the cells_1

The skin has three layers. They are
epidermis, dermis and subcutaneous tissues
Epidermis
Stratum corneum/ horny layer
Stratum lucidum
Stratum granulosum/ granular layer
Stratum spinosum/ spinous layer
Stratum basale/ basal layer
The
major cells in epidermis
Keratinocyte:
Cormeocyte:
Melanocyte
Langerhans cell
Merkel cell
Melanocyte
l In stratum basale
l The cell density is
1000-1500unit/mm2
l Different body part has different
Melanocyte density
l excrete melanin
in Keratinocyte to protect UV ray and reduce
the chemical from environment
Langerhans
cell
l in Stratum granulosum
l cell desnity is 400-1000unit/mm2
l It is like the white blood cell to
prevent infections.
l It trigger immune system by
interacting with antigen and T-cells .
Merkel
cell
l In Stratum basale
l Connect the surrounding
Keratinocyte
l Are more in finger, oral cavity,
and hair root
l They are derived from neural
crest cells. They also as touch cells
basement membrane
The basement membrane is a thin, fibrous, extracellular matrix of tissue that separates the epithelium, mesothelium and endothelium from underlying connective tissue. (ref. wikipedia )
It is the
crucial tissue for the transdermal diffusion effect.
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