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Objective 5

Objective 5. Name the tissue types composing the dermis and epidermis; including layers and functions. Skin Structure. Epidermis – outer layer Stratified squamous epithelium Often keratinized (hardened by keratin) Dermis Dense connective tissue. Figure 4.3. Skin Structure.

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Objective 5

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  1. Objective 5 Name the tissue types composing the dermis and epidermis; including layers and functions.

  2. Skin Structure • Epidermis – outer layer • Stratified squamous epithelium • Often keratinized (hardened by keratin) • Dermis • Dense connective tissue Figure 4.3

  3. Skin Structure • Deep to dermis is the hypodermis • Not part of the skin • Anchors skin to underlying organs • Composed mostly of adipose tissue

  4. Layer of Epidermis • Stratum basale (“base” – deepest layer) • Cells undergoing mitosis • Lies next to dermis • Stratum spinosum • Web-like system of filaments • Stratum granulosum • 3-5 layers thick Waterproof • Last layer with capillaries/blood

  5. Layer of Epidermis • Stratum lucidum • Occurs only in thick skin • Clear, flat dead cells • Stratum corneum – only layer you can see! • Shingle-like dead cells • 75% of the epidermis • Protection • “Beauty is Only Skin Deep?” … • All we see are dead cells!!! HAHAHAHA…

  6. Melanin • Pigment (melanin) produced by melanocytes • Color is yellow to brown to black • Melanocytes are mostly found in the stratum basale • Amount of melanin produced depends upon genetics and exposure to sunlight (tanning)

  7. Dermis • Two layers • Papillary layer • Projections called dermal papillae • Pain receptors • Capillary loops • Reticular layer • Blood vessels • Glands • Nerve receptors

  8. Skin Structure Figure 4.4

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