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Published byGertrude Hicks Modified over 9 years ago
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Integumentary System
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Membranes 1.Serous 2.Mucous 3.Synovial 4.Cutaneous
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Serous Membranes Serve as inner linings Secrete a watery serous fluid
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Mucous Membranes Line cavities and tubes that open to the outside Secrete mucus
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Synovial Membranes Line joint cavities Secrete a thick colorless synovial fluid.
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Cutaneous Membrane “skin”
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Skin and its Tissues Two distinct layers –Epidermis –Dermis
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Epidermis Stratified squamous epithelium Lacks blood vessels Older outer level cells are keratinized.
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Most important function is to protect the body Contains specialized cells, melanocytes –Produce melanin: produces skin color, absorbs light
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Dermis Binds the epidermis to the underlying tissues Contains blood vessels, nerve fibers, hair follicles, sebaceous glands, sweat glands.
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Subcutaneous Layer “hypodermis” Contains adipose tissue to insulate Contains the major blood vessels that supply the skin
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Accessory Organs of the Skin Hair follicle –Root –Shaft –Errector pili muscle
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Sebaceous glands –sebum
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Nails –Nail root –Lunula –Nail bed
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Sweat glands –Exocrine –Pore –Apocrine glands
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Regulating Temperature Sweat, as the liquid evaporates the surface is cooled Vasodilation, allows heat to leave the vessels Vasoconstriction…
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Healing wounds Inflammation, the result of fluids being forced out of vessels and into damaged tissues –This provides a wealth of nutrients. Scab (152-153) Scar granulation
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