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The integumentary system (skin) Roles: protection maintenance of normal body temperature storage (of fat) synthesis

The integumentary system (skin) Roles: protection maintenance of normal body temperature storage (of fat) synthesis (of vitamin D) excretion (of salts, water and wastes in sweat) sensory perception. Tissues of the skin epidermis- straitified squamous epithelium

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The integumentary system (skin) Roles: protection maintenance of normal body temperature storage (of fat) synthesis

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  1. The integumentary system (skin) Roles: protection maintenance of normal body temperature storage (of fat) synthesis (of vitamin D) excretion (of salts, water and wastes in sweat) sensory perception

  2. Tissues of the skin epidermis- straitified squamous epithelium basement membrane dermis- largely connective tissue; many nerves and blood vessels; smooth muscle hypodermis- adipose tissue and more loose connective tissue

  3. Epithelium deepest layer (stratum germinativum, or stratum basale)- rapidly dividing cells stem cells present outermost layer- stratum corneum dead, keratinized cells Melanocytes in stratum basale- produce pigment absorbs UV radiation; surround nucleus Cells vary in amount of melanin they produce

  4. Epidermal cells make a precursor form of vitamin D Modified in liver and kidney Required for bone formation “Protection” includes immune protection Langerhans (dendritic) cells keratinocytes specialized T cells

  5. Dermis- capillaries and nerves deeper layers are dense connective tissue; superficial layers are loose Subcutaneous layer loose connective and adipose tissue shock absorption, insulation, energy

  6. Accessory structures Originate in epidermis (hair follicle), extend into dermis arrector pili muscle attached Hair is pigmented; determined by amount of melanin (Red hair requires a different pigment) Pigment production decreases with age Several specialized types of hair

  7. Nails Nail bed overlaid by nail plate Nail growth originates from root; cells become keratinized Cuticle is formed from stratum corneum

  8. Two types of exocrine glands Sebaceous- sebum (oil, wax) associated with hair follicles helps maintain pliability of skin Sweat glands apocrine (armpits, groin) merocrine (eccrine)- widely distributed important for maintaining body temperature

  9. Aging and the integumentary system Declines in: Cell division in stratum basale Melanocyte production Glandular activity Hair follicle function Elastic fiber function in dermis Blood supply to skin Rate of repair

  10. Problems of skin Lesions infections (bacterial, viral, fungal,parasitic) inflammatory reactions allergens Hyperkeratinization Tumors basal cell (stratum basale) squamous cell melanoma

  11. Trauma abrasions, incisions, lacerations Repair inflammation scab formation fibroblast activity (scar formation) Burns- severity depends on depth of damage Rashes- so many causes!

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