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Human Anatomy Integumentary System. Introduction Largest organ of the bodyLargest organ of the body 21 square feet, 1.5-2 square meters21 square feet,

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Presentation on theme: "Human Anatomy Integumentary System. Introduction Largest organ of the bodyLargest organ of the body 21 square feet, 1.5-2 square meters21 square feet,"— Presentation transcript:

1 Human Anatomy Integumentary System

2 Introduction Largest organ of the bodyLargest organ of the body 21 square feet, 1.5-2 square meters21 square feet, 1.5-2 square meters 4 kilograms, 9 pounds, 7% - 15% of total body weight4 kilograms, 9 pounds, 7% - 15% of total body weight One square inch containsOne square inch contains –20 blood vessels –65 hairs and hair muscles –78 nerves –78 sensors for heat –13 sensors for cold –160 sensors for pressure –100 sebaceous/oil glands –650 sudoriferous/sweat glands –1300 nerve endings –19,500,000 cells –0.5 million cells dying and being replaced

3 Function Protection: barrier against microbes, dirt, chemicals; shock bsorberProtection: barrier against microbes, dirt, chemicals; shock bsorber Water balance: prevents loss of water and absorptionWater balance: prevents loss of water and absorption Temperature regulation: blood vessels near surface vasoconstriction / vasodilationTemperature regulation: blood vessels near surface vasoconstriction / vasodilation Waste disposal: excretion of oil, water, Na+, CO2, etc.Waste disposal: excretion of oil, water, Na+, CO2, etc. Receptor organs: sensations of touch, pain, heat, cold, pressureReceptor organs: sensations of touch, pain, heat, cold, pressure Vitamin D productionVitamin D production

4 EpidermisEpidermis DermisDermis Subcutaneous (hypodermis)Subcutaneous (hypodermis) Layers of the Skin

5 Epidermis Outermost layer of skinOutermost layer of skin Composed of 5 layersComposed of 5 layers Avascular – no bloodAvascular – no blood supply supply Complete regeneration inComplete regeneration in approximately 35 days approximately 35 days Some regions are thickerSome regions are thicker than others (thinner on than others (thinner on scalp and armpit than on scalp and armpit than on sole of foot) sole of foot)

6 Dermis Called ‘corium’ or the true skinCalled ‘corium’ or the true skin Framework of elastic connective tissue and blood vesselsFramework of elastic connective tissue and blood vessels ContainsContains Blood vessels and capillariesBlood vessels and capillaries Lymphatic vesselsLymphatic vessels NervesNerves Involuntary musclesInvoluntary muscles Sweat and oil glandsSweat and oil glands Hair shafts and hair folliclesHair shafts and hair follicles Sensory receptorsSensory receptors

7 Subcutaneous – Hypodermis Innermost layerInnermost layer Composed of:Composed of: –elastic and fibrous connective tissue –Adipose (fatty) tissue Connects skin to underlying musclesConnects skin to underlying muscles

8 Accessory Structures Nails: keratinized/dead epidermis that grows under the lunula (white portion) of nailbed Hair –follicles –shafts –arrector pili – hair muscles – causes ‘goosebumps’ Glands Sudoriferous -- sweat glands (opening is called a pore)Sudoriferous -- sweat glands (opening is called a pore) Sebaceous -- oil glands: secretes sebum as lubricant, most open onto a hair follicle (plugged = blackhead)Sebaceous -- oil glands: secretes sebum as lubricant, most open onto a hair follicle (plugged = blackhead) Ceruminous glands: secrete cerumen (earwax)Ceruminous glands: secrete cerumen (earwax)

9 Skin Color Melanin Only pigment made in the skinOnly pigment made in the skin Yellow to reddish-brown to blackYellow to reddish-brown to black Racial differences due to kind and amount of melanin madeRacial differences due to kind and amount of melanin made Local accumulations.. freckles and pigmented molesLocal accumulations.. freckles and pigmented moles Exposure to sunlight increase manufacture of melanin.. protects DNA from UV damage and results in a tanExposure to sunlight increase manufacture of melanin.. protects DNA from UV damage and results in a tanCarotene Yellow to orangeYellow to orange Accumulates in the stratum corneum and fatty tissue of hypodermisAccumulates in the stratum corneum and fatty tissue of hypodermis Color obvious in palms and solesColor obvious in palms and soles


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