Lec2IntegumentI

Lec2IntegumentI - The Integumentary System I Overview...

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The Integumentary System I
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• Integument=Skin • Derived from a Latin word meaning “to cover” • Skin is a complex, integrated, and dynamic organ that has functions beyond it’s role as a barrier to the environment • Skin is the largest organ system in the body Overview
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• Integument I: Overview, Epidermis • Integument II: Dermis, Glands, Hair • Integument III: Digital Organs, Horn
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• Basic architecture of skin is the same in all mammals • There are differences in the thickness of different layers of skin in various regions of the body between species and within the same species • Skin is thickest over the dorsal surface of the body and on the lateral surfaces of the limbs Overview
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Functions of the Skin • Protection - trauma - desiccation - pathogens (bacteria and viruses) - UV light - noxious gases and fluids - camouflage • Secretory - primary source of water loss (primates and horses) - electrolytes (sweat) - fats and mucous (forms a barrier for protection) - pheromones (aids in interaction between members of a species)
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Functions of the Skin • Regulation of Body Temperature - release of water (sweating) for cooling - layer of insulation - blood flow regulation to maintain constant temperature • Metabolic Functions - primary source of vitamin D via cellular interaction with sunlight - energy storehouse (adipose tissue, dermal fat pads)
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Three Layers of Skin • Epidermis - Outermost layer of skin - Forms protective barrier - Keratinized stratified squamous epithelium - Outermost layer is composed of dead cells in mammals and birds - In regions with a heavy protective coat of hair, epidermis is thin - In non-hairy skin the epidermis is thicker - Hair and nails are epithelial tissues and as such are part of the epidermis - Digital organs (hoof, claw), feathers, horns are also considered epidermis
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Three Layers of Skin • Dermis (Corium) - Located beneath the epidermis - Consists of connective tissue, which is made up collagen
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This note was uploaded on 01/20/2010 for the course NPB NPB123 taught by Professor Meyers during the Winter '10 term at UC Davis.

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Lec2IntegumentI - The Integumentary System I Overview...

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