Индивидуальный проект "Дерматология"

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The Skin as an Organ

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An organ, cells constantly dying and being replaced Facts: Weighs 9-11 lbs s.a. = 1.5-2 m 2 1 cm 2 has 70 cm blood vessels, 55 cm nerves, 100 sweat glands, 15 oil glands, 230 sensory receptors New skin produced in 25-45 days The Skin

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The Epidermis

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Cells of the Epidermis Keratinocytes (90%)- waterproofs & protects skin, nails, hair, stratum corneum Melanocytes (8%)- produce melanin Merkel Cells - slow mechanoreceptors Langerhans’ Cells - immunological defense

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Layers of the Epidermis Stratum Corneum Stratum Lucidum Stratum Granulosum Stratum Spinosum Stratum Basale- (Germinativum)

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Layers of the Epidermis

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The Dermis Dermis

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Layers of the Dermis papillary dermis reticular dermis

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This layer contains adipose tissue and serves to attach the dermis to its underlying tissues. The Hypodermis Hypodermis

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Protection- mechanical, chemical, bacterial Body temperature regulation Prevent water loss Metabolic- synthesize vitamin D Cutaneous Sensation Blood reservoir Excretion Prevent UV damage Function

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Summary Skin is composed of three primary layers: - the epidermis, - the dermis - the hypodermis Skin performs the following functions: - Protection - Sensation - Heat regulation - Control of evaporation - Storage and synthesis - Excretion - Absorption - Water resistance