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Integumentary System (Skin)

Integumentary System (Skin). Integumentary System. Structure: Epidermis: Stratum corneum: dead cells, mostly keratin. Stratum lucidum: dead keratyoncytes; not present in all the skin. Stratum granulosum: Lamelated granules (waterproofing) Keratohyaline granules.

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Integumentary System (Skin)

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  1. Integumentary System(Skin)

  2. Integumentary System • Structure: • Epidermis: • Stratum corneum: dead cells, mostly keratin. • Stratum lucidum: dead keratyoncytes; not present in all the skin. • Stratum granulosum: • Lamelated granules (waterproofing) • Keratohyaline granules. • Stratum spinosum: prekeratin. • Stratum basale • Dermis • Papilar layer • Reticular layer • Function • Protection • Insulation • Chemical damage • Bacterial invasion • Dehydration • Temperature regulation • Secretory • Urea, salts, water • Synthesis of vitamin D • Sensory

  3. Figure 5.1

  4. Cells in the Epidermis • Keratynocytes • Produce keratin • Melanocytes • Produce melanin pigment • Langerham’s cells • Immunity • Merkel cells • Touch receptors

  5. Cells in the Dermis • Meissner’s corpuscles • Papillary layer (areolar conective tissue): pain and touch receptor. • Paccinian corpuscles • Reticular layer (dense irregular): pressure receptor.

  6. Figure 5.2

  7. "Cher Likes Getting Skin Botoxed" (from superficial to deep) • "Before Signing, Get Legal Counsel" (from deep to superficial) • "Before Sex Get Latex Condoms (from deep to superficial)

  8. Figure 4.37

  9. Accesory organs of the skin • Nails • Hair • Hair • Follicle • Arrector pilli muscle • Cutaneous glands • Sebaceous: skin moisture. • Sweat • Ecrine (merocrine sweat glands) temperature regulation through perspiration. Appocrine:axillary and genital area (fats, water, salts, urea): pheromones?

  10. Nails Figure 5.6

  11. Figure 5.4

  12. Hair (transverse view) Figure 5.5a, b

  13. Hair follicle (longitudinal view) Figure 5.5c, d

  14. Figure 5.3

  15. Figure 5.3a

  16. Sweat gland Figure 5.3b

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