Notes Introduction to SkinCHS19.pptx - Integumentary System...

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Integumentary System: Skin (Cutaneous Membrane)
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Integumentary System Skin (cutaneous membrane) Skin derivatives (Skin Appendages) Made by the skin Sweat glands Oil glands Hairs Nails
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Skin and Its Tissues The skin is a large organ responsible for maintaining homeostasis through temperature regulation, protection of underlying tissues, retardation of water loss, housing sensory receptors, synthesizing certain chemicals, and excreting wastes.
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Skin Functions Protects deeper tissues from: Mechanical damage Chemical damage Bacterial damage Thermal damage Ultraviolet radiation Desiccation
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Skin Functions Aids in heat regulation Aids in excretion of urea and uric acid Synthesizes vitamin D
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Epidermis – Things of Note Avascular – has no blood supply Nourishment comes from capillaries in the dermis 4 or 5 layers of cells Made up of Stratified squamous epithelim Each layer has layers of cells within it Cells move from the bottom layer to the top, slowly dying and filling with protective protein in the process Most of the cells are Keratinocytes Produce Keratin
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Epidermis – Things of Note Layer of Epidermis Stratum Basale Bottom most layer( well nourished by dermal blood vessels). Lies on top of dermis Cells undergoing mitosis Millions of new cells produced daily New cells are pushed upward As cells move up Become flatter, fill with Keratin that will become hardened protective layer Move further away from nourishment and die
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