Integumentary System _Fall 2010

Integumentary System _Fall 2010 - Integumentary System EXSS...

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Integumentary System EXSS 75 - Human Anatomy
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Body Membranes 2 Major Groups Epithelial Membranes Ø Contain epithelial layer & underlying connective tissue Ø 3 Types: Cutaneous (skin) Mucous Serous Connective Tissue Membranes Ø Synovial
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Epithelial Membranes: Cutaneous Membrane “Skin” Discussed in detail later
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Epithelial Membranes: Mucous Membrane Lines body cavities that open directly to exterior Ø Exp: respiratory, digestive, urinary, reproductive Composition: Ø Epithelium resting on a loose connective tissue membrane (lamina propria) Lamina propria: connection & flexibility to underlying tissue Function: Ø Defense mechanism Ø Prevents cavities from drying out Ø Lubricates GI tract
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Epithelial Membranes: Serous Membranes Lines body cavities closed to exterior & covers organs within cavities Two layers: (balloon-like formation) Ø Parietal Attached to cavity wall Folds on itself to form the visceral layer Ø Visceral Covers & attaches organs within a cavity Ø Balloon-like = Push fist into balloon Balloon to fist = Visceral Outer wall of balloon = Parietal
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Epithelial Membranes: Serous Membranes Both layers secrete serous fluid Ø Watery, lubricating fluid Organs easily slide across membrane & other organs Locations: Ø Peritoneum: abdominal cavity & organs Ø Pleura: lungs Ø Pericardium: heart cavity & heart
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Connective Tissue Membrane: Synovial Membrane Composition: Ø Connective tissue (fibrous), do not contain epithelial cells Location: Ø Line cavities of freely movable joints (articular) Ø Surround tendons or form sacs (bursa) Function: Ø Secrete synovial fluid that lubricates bones & provides nutrients Ø Bursa: cushioning and lubrication between tendons & bones
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INTEGUMENTARY SYSTEM Components: Ø Skin = Cutaneous Membrane Ø Accessory structures: Sweat glands, oil glands, hairs, nails, & sensory structures
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Basic Skin Functions Skin = “Integument” = covering Ø Protection 6 protective functions Ø Regulate body temperature Sweat Ø Excretion Urea & uric acid Ø Synthesizes Vitamin D Interaction with UV rays Ø Blood resevoir
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Protective Functions of Skin 1. Mechanical Damage Ø Pressure receptors 2. Chemical Damage Ø Pain receptors 3. Bacterial Ø Preventing invasion of foreign substances Ø Prevents infections 4. Ultraviolet Radiation Ø Melanocytes protect from harmful UV rays 5. Thermal Damage Ø Heat / cold damage 6. Desiccation Ø Drying out / waterproof
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Structure of Skin Epidermis (superficial, thinner, avascular) Composition: stratified squamous epithelium Ø Capable of “Keratinizing” (becomes hard & tough) 4 major cell types 4-5 layers Dermis (deeper, thicker, vascular) Composition: dense fibrous connective tissue 2 layers Subcutaneous (deepest, not part of skin) Composition: Areolar tissue containing fat cells Ø Anchors skin to underlying organs Ø “shock absorber & insulator”
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Epidermis 4 Major Cell Types Keratinocytes: produces keratin Ø Toughens & waterproofs skin
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This note was uploaded on 11/16/2011 for the course EXSS 175 taught by Professor Zinder during the Fall '08 term at UNC.

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Integumentary System _Fall 2010 - Integumentary System EXSS...

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