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The Integumentary System

The Integumentary System. The Skin. Waterproof Self repairing Chemical Barrier Physical Barrier Biological Barrier Thermoregulatory. Cells of the Epidermis. Keratinocytes- contain kerotin Melanocytes- melanin production Langerhans’ cells- epidermal macrophage

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The Integumentary System

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  1. The Integumentary System

  2. The Skin • Waterproof • Self repairing • Chemical Barrier • Physical Barrier • Biological Barrier • Thermoregulatory

  3. Cells of the Epidermis • Keratinocytes- contain kerotin • Melanocytes- melanin production • Langerhans’ cells- epidermal macrophage • Merkel cells- touch receptors

  4. Dermis • Connective tissue • Vascularized and innervated • Fibroblasts, macrophages, mast cells and white blood cells • Two layers – papillary and reticular

  5. Sweat Glands • Thermoregulatory role • Two main types • Eccrine sweat glands – found in palms, soles of the feet, and forehead • Apocrine sweat glands – found in axillary and anogenital areas

  6. Sebaceous Glands

  7. Hair Structure • Made up of the shaft projecting from the skin, and the root embedded in the skin • Consists of a core called the medulla, a cortex, and an outermost cuticle • Pigmented by melanocytes at the base of the hair

  8. Hair Follicle Figure 5.5a

  9. Nail matrix Root of nail Proximal nail fold Eponychium (cuticle) Body of nail Free edge of nail Nail bed Body of nail Free edge of nail Lateral nail fold Hyponychium Phalanx (bone of fingertip) Lunula Eponychium (cuticle) (a) (b)

  10. Epithelial Membranes

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