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Layers of Epidermis
Descriptions of
5
Anatomy
Graduate
01/15/2013

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Cards

Term
Stratum Corneum
Definition
Dead cells with a hard envelope; the cells contain keratin and are surrounded by lipids
Term
Stratum Lucicidum
Definition
present only in thick skin; 3-5 layers clear, flat dead keratinocytes packed with keratin filaments
Term
Stratum Granulosum
Definition
3-5 layers of keratinocytes that undergo apoptosis; keratohyaline granules convert tonofilaments into keratin; lamellar granules release water repellant sealant; marks transition between metabollically active cells below them and dead cells above
Term
Stratum Spinosum
Definition
superficial to the basal layer; 8-10 layers of keratinocytes fitting closely together; shrink and pull apart and appear like having spine like processes
Term
Stratum Basale
Definition
Deepest layer; some are stem cells (continue to produce new keratinocytes); melanocytes and merkel cells; tonofilaments (intermediate); desmosomes bind to adjacent cells and hemidesmosomes
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