EPIDERMIS%20NOTES

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EPIDERMIS NOTES
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• Made of TWO layers
• Epidermis outer layer
• Made of keratinized stratified squamous
  epithelium
• Dermis inner layer

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• Hypodermis (Subcutaneous Layer) lies underneath
  dermis
• NOT part of skin

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LAYERS OF THE EPIDERMIS

• Stratum basale
• Closest to dermis
• Stem cells that produce keratinocytes (produce
  keratin)
• Contain Melanocytes
• Produce brown/yellow pigment melanin

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• Same of melanocytes for all races
• Skin color due to difference of melanin production

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• Stratum spinosum
• (8-10 layers attached by desmosomes)
• Keratinocytes take in melanin

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• Stratum granulosum
• 3-5 layers
• Keratinization begins here
• Cells beginning to die

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• Stratum lucidum (lucid clear)
• More apparent in thick skin
• 3-5 layers of clear cells

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• Stratum corneum
• Dead, flat cells full of keratin
• Keratin is waterproof
• Cells are shed
• Basal cell to surface about 2-4 weeks

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