skin layers of skin epidermis dermis hypodermis
TRANSCRIPT
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SKINSKIN
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Layers of SkinLayers of SkinEpidermis
Dermis
Hypodermis
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Facts about the skinFacts about the skin
Different thickness -.5mm (eyelid) Different thickness -.5mm (eyelid) to 5mm (middle of your backto 5mm (middle of your back
21.5 square feet surface of your 21.5 square feet surface of your body.body.
Skin is the largest organ of the Skin is the largest organ of the body.body.
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EpidermisEpidermis Greek = epi, over & derma, skin.Greek = epi, over & derma, skin. Top layer of epidermis is called Stratum Top layer of epidermis is called Stratum
corneum - soft keratin which keeps the corneum - soft keratin which keeps the skin elastic.skin elastic.
Stratum lucidum -has translucent layers of Stratum lucidum -has translucent layers of dead cell that contain protein called eleidin dead cell that contain protein called eleidin which is only in the palms of the hands which is only in the palms of the hands and soles of the feet.and soles of the feet.
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More Layers of epidermisMore Layers of epidermis
Stratum granulosumStratum granulosum - layer of dying cells - layer of dying cells Stratum spinosumStratum spinosum - interlocking spine- - interlocking spine-
like projections help support this binding like projections help support this binding layer.layer.
Stratum basaleStratum basale -basement next to the -basement next to the dermis. Continuous cell division - new dermis. Continuous cell division - new cells are made. Where melanocytes are cells are made. Where melanocytes are found.found.
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DermisDermisMeans True SkinMeans True SkinPapillary layerPapillary layerReticular layerReticular layerHypodermis layerHypodermis layer
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Papillary layerPapillary layerLoose connective tissueLoose connective tissuePapillae helps to join to Papillae helps to join to
epidermisepidermisDouble layers in hands and Double layers in hands and
solessolesCauses finger printsCauses finger printsAids in gripping surfacesAids in gripping surfaces
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Reticular layerReticular layerDense connective tissueDense connective tissueCoarse caliginous fibers Coarse caliginous fibers
and bundlesand bundlesFibers crisscross forming a Fibers crisscross forming a
strong, elastic layerstrong, elastic layer
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Reticular layerReticular layerWhere most of the gland and Where most of the gland and
things are located.things are located.HairHairOil glandOil glandCorpuscles of touchCorpuscles of touch
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HypodermisHypodermisAlso known as Also known as Subcutaneous layerSubcutaneous layerLies beneath the dermisLies beneath the dermisComposed of loose, fibrous Composed of loose, fibrous
connective tissueconnective tissueThicker than the dermisThicker than the dermisLarge supply of lymphatic and Large supply of lymphatic and
blood vesselsblood vessels
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HypodermisHypodermisSweat glands (sudoriferous)Sweat glands (sudoriferous)Base of hair folliclesBase of hair folliclesCan be tight or looseCan be tight or looseMore hypodermis give us More hypodermis give us
paddingpaddingHeelsHeelsBreastBreast
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Function of SkinFunction of SkinTemperatureTemperature
SweatSweatConstriction & dilation of blood Constriction & dilation of blood
vesselsvesselsGoose bumpsGoose bumps
ExcretionExcretionSweatSweat1g nitrogen every hour1g nitrogen every hour
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More FunctionsMore FunctionsSynthesisSynthesis
Vitamin D - makes strong bones Vitamin D - makes strong bones and teethand teeth
Helps to prevent RicketsHelps to prevent RicketsSensory receptionSensory reception
Heat & coldHeat & coldTouch & pressureTouch & pressurePainPain
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Color of SkinColor of SkinPresence of MelaninPresence of Melanin
Dark skinned people produce Dark skinned people produce moremore
Asian people have very little Asian people have very little Accumulation of caroteneAccumulation of caroteneBlood reflected through Blood reflected through
epidermisepidermis
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Platelets (thrombocytes) and Platelets (thrombocytes) and fibrinogen form a netfibrinogen form a net
Less than 24 hrs. becomes dehydrated Less than 24 hrs. becomes dehydrated and a scab forms.and a scab forms.
Two or three days after the wounding, Two or three days after the wounding, monocytes enter the wound.monocytes enter the wound.
About 10 days after, epidermis is About 10 days after, epidermis is restored & the scab is gone. Tough restored & the scab is gone. Tough scar tissue continues to form.scar tissue continues to form.
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Sudoriferous (Sweat) GlandSudoriferous (Sweat) Gland
Eccrine glandEccrine gland Over entire bodyOver entire body None in nail beds, lips, eardrumNone in nail beds, lips, eardrum Secrete perspirationSecrete perspiration Emotions cause the palms, fingers and soles Emotions cause the palms, fingers and soles
to respond more.to respond more. Keeps the body from over heatingKeeps the body from over heating
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Sudoriferous (Sweat) GlandSudoriferous (Sweat) Gland Apocrine or odiferous glandApocrine or odiferous gland
In armpits, dark region around nipples, In armpits, dark region around nipples, othersothers
Female breast contain these glands that Female breast contain these glands that adapted to secrete and release milk.adapted to secrete and release milk.
Become active at pubertyBecome active at puberty Respond to stress and has an odor.Respond to stress and has an odor. Contains a specific human pheromoneContains a specific human pheromone Glands in the ear canals that produce wax.Glands in the ear canals that produce wax.
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Sebaceous (Oil) GlandsSebaceous (Oil) Glands
LubricationLubricationProtection against bacteria & Protection against bacteria &
fungifungiPermeability barrierPermeability barrierSkin softening agentSkin softening agent
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ProtectionProtection Scalp hair protects & insulationsScalp hair protects & insulations Eyelashes & eyebrowsEyelashes & eyebrows Arrector pili muscleArrector pili muscle Parts are Parts are
Shaft, Shaft, RootRoot BulbBulb
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Parts of the SkinParts of the Skin
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When things When things go Wronggo Wrong
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Blackheads & PimplesBlackheads & Pimples
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WartsWarts
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Ring WormRing Worm
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StaphylococciStaphylococci
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StaphylococciStaphylococci