Epidermis (Layers--superficial to deep) - ACCURATE ANSWERS✔✔ -
Stratum corneum
-stratum lucidum
-stratum granulosum
stratum spinosum
-stratum basle
Epidermis - ACCURATE ANSWERS✔✔ -Outermost layer
-uniform thickness (except palms/soles = 0.06-0.6 mm)
-Stratified squamos epithelial cells ( 20 cells thick; Very young/old have
only 12)--> leads to more wounds
-5 Layers
Stratum Corneum - ACCURATE ANSWERS✔✔ -Top horny Layer
-cells elongate
,-dead keratinized cells
-sloughs off and is replaced by cells below
Stratum Lucidum - ACCURATE ANSWERS✔✔ -Few Layers of dead
keratinocytes
Stratum Granulosum - ACCURATE ANSWERS✔✔ -3-5 layers of cells
-Diamond Shaped Cells
Stratum Spinosum - ACCURATE ANSWERS✔✔ -Prickly Layer
-Cells have active nuclei
Stratum Basale - ACCURATE ANSWERS✔✔ -AKA- Basal Layer
(Stratum Germinativum)
-Attached to dermis by basement membrane
-Takes 2-4 weeks to migrate upward
-Melanocytes
Basement Membrane - ACCURATE ANSWERS✔✔ -Separates
epidermis from dermis
-Rete pegs - point up
-Rete ridges - point down
-Ancer epidermis to dermis
-Flattens with age (leads to ski tears)
, Langerhans Cells - ACCURATE ANSWERS✔✔ -Produced in bone
marrow
-migrate to epidermis
-Fight bacteria and viral fungal infection
-Decrease with Age and UV exposure --> decrease immune function
Papillary Dermis - ACCURATE ANSWERS✔✔ -Layer just below the
basement membrane
-Elastic Fibers
-Papillary loops provide nutrients to dermis
Reticular Dermis - ACCURATE ANSWERS✔✔ -Forms base of dermis
-Thick collagen fibers
-Cutaneous blood vessels
Important Dermal Cells - ACCURATE ANSWERS✔✔ -Fibroblasts
-Macrophages
-Mast Cells
-Nerve Cells
-Epidermal Appendages
Fibroblasts (dermal cells) - ACCURATE ANSWERS✔✔ -produce
collage and elastin
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