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Organization Skin Epidermis Dermis Accessory Structures Hair & Hair follicles

Explore the organization of the skin layers including epidermis and dermis, functions such as protection, temperature regulation, and sensory receptors beneath the skin. Learn about hair follicles, exocrine glands, and accessory structures that make up the skin system.

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Organization Skin Epidermis Dermis Accessory Structures Hair & Hair follicles

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  1. Organization • Skin • Epidermis • Dermis • Accessory Structures • Hair & Hair follicles • Exocrine glands • Arrector pili • Sensory Receptors

  2. Layers beneath the skin • Subcutaneous layer • Deep fascia ________________________

  3. Functions of the Skin • Protection • Water-resistance • Temperature regulation • Vitamin D synthesis • Sensations • Immunity • Social signaling

  4. The Epidermis • Stratum Germinativum • Stem cells • Melanocytes • Merkel cells

  5. The Epidermis • S. Spinosum • “Pre-keratinocytes” • Melanocytes • Langerhans cells

  6. The Epidermis • S. Granulosum • S. Lucida • Keratinocytes in both layers

  7. The Epidermis • S. Corneum • Dead keratinocytes

  8. Skin cell-eating mite

  9. The Dermis

  10. The Dermis • Reticular layer • Dense irregular CT • Provides strength and elasticity

  11. The Dermis • Papillary layer • Areolar CT • Contains cap’s and sensory neurons for epidermis • Arranged as dermal papillae

  12. Pigmentation • Melanin • Carotene • Hemoglobin

  13. Epidermal Derivatives • Hair Follicles and Hair • Skin Glands

  14. Hair • Function • Protection • Touch Sensation • Structure • Root • Shaft • Bulb

  15. Hair • Hair Follicle • Sheath of epithelial cells • Surrounds root • Merges with bulb

  16. Hair • Associated structures • Dermal papilla • Sebaceous glands • Arrector pili

  17. Hair • Growth Cycle • 2-5 yrs: growth stage • 2 yrs: resting stage

  18. Sebaceous glands secrete sebum help to protect hair and skin Skin Glands

  19. Merocrine (eccrine) sweat glands BT control excretion protection Skin Glands

  20. Skin Glands • Apocrine sweat glands • Secrete pheromones?

  21. Skin Glands • Mammary glands • Ceruminous glands

  22. Skin Sensory Receptors • Free nerve endings • Pacinian corpuscles • Meissner’s corpuslces

  23. Lines of Cleavage

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