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Z331 Fall 2010 Ecampus Week 9 and 10 Integument Lecture 2 Dermis Posted
Course: ZOOLOGY 331, Fall 2010School: Oregon State University
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TheIntegumentarySystem:TheDermis Weeks9and10:Lecture2:Chapter5: Anchorsepidermalaccessory structures Has2components: superficialpapillarylayerareolar CT deepreticularlayerdense irregularCT TheDermis Figure51,154 Remember:ConnectiveTissues? (p118) Support,surround,interconnect Providestructure Storeenergy Transportmaterials Protect&defend CharacteristicsofConnective Tissues Specializedcells...
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TheIntegumentarySystem:TheDermis
Weeks9and10:Lecture2:Chapter5: Anchorsepidermalaccessory structures Has2components: superficialpapillarylayerareolar CT deepreticularlayerdense irregularCT
TheDermis
Figure51,154
Remember:ConnectiveTissues? (p118)
Support,surround,interconnect Providestructure Storeenergy Transportmaterials Protect&defend
CharacteristicsofConnective Tissues Specializedcells
VarydependingontypeofCT majorityoftissuevolume Solidproteinfibers Fluidgroundsubstance
fillsspacesbetweencells
Figure48,p119
Matrix(extracellularcomponents)
ClassificationofConnectiveTissues
Connectivetissueproper:
connectandprotect
Fluidconnectivetissues:
transport
Supportiveconnectivetissues:
structuralstrength
Fibroblasts Macrophages Adipocytes Mesenchymal cells Melanocytes Mastcells Lymphocytes Microphages
CellTypesofCTP
Figure48,p119
Collagen Reticular Elastic
FibersinCTP
Figure48,p119
Categoriesof ConnectiveTissueProper(CTP) Embryonic
foundonlyinembryo
Looseconnective tissue:
Denseconnective tissue:
morefibers,less groundsubstance
moreground substance,lessfibers
Areolar CT
Figure48,p119
CTP:DenseIrregularConnectiveTissues
Strengthinmanydirections Interwovennetworksofcollagenfibers: layeredinskin Figure411b aroundcartilages(perichondrium) aroundbones(periosteum) formcapsulesaroundsomeorgans(e.g.,liver,kidneys)
Strong,duetocollagenfibers Elastic,duetoelasticfibers Fibersinthedermis:
CharacteristicsofDermis
Flexible&Resilient(skinturgor)
arearrangedinparallelbundles= Linesofcleavage resistforceinaspecificdirection
http://www.rehydrate.org/shows/acute/di arrhoea-acute-04.htm
Saladin,4thed.,fig6.5
Seeley,fig5.3,7th
Skeletalmusclesoffaceinsertintocollagen fibersofdermis&pullontheskin
ImportanceofSkininNonverbalExpression
Saladin,4thed.,fig106&107
CharacteristicsofDermis Containsmanynerve endings/receptors
Thibodeau,6thed., Ishighlyvascular fig.65
Figure51,154
CharacteristicsofDermis Contusion
Thibodeau,6thed., fig.610
Seeley,fig5.9,7th Figure51,154
The distribution of the blood vessels in the skin of the sole of the foot.
http://www.bartleby.com/107/illus942.html
http://www.greglasley.net/Images/Black-tailed-JackF4.jpg
Thibodeau,6thed., fig.612&625
Characteristicsof Dermis: Thermoregulation workswith
cardiovascularsystemto regulatebody temperature Skinactsasaradiator removesheatfrom
Sherwood,fig.15 21
CharacteristicsofDermis: Thermoregulation
Thibodeau,6thed., fig.613
Dermatitis:inflammationofthepapillarylayer StretchMarks:Thickenedtissueresultingfromexcessive stretchingofskin Saggingandwrinkles(reducedskinelasticity)arecaused by: dehydration Age Reducedbloodsupply Decreasedfunctionofhairfollicles http://www.stretchmarkrepair.com/pictures/BeforeAfter01.JPG Reductionofelasticfibers Decreasedhormonelevels Slowerrepairrate hormonalchanges UVexposure
Seeley,fig5.10,7th
DamagetoDermis
Thesubcutaneouslayer=hypodermis= superficialfascia:
TheHypodermis
stabilizestheskin,allowsseparatemovement Areolar&adipose tissue
Thibodeau,6thed., fig.62
Figure51,154
Deepfascia coversskeletal muscles
Fig 1.9, Moore & Dalley 2006
Fig 11-16, p 357
Mostsuperficial Epidermis Dermis Hypodermis Deepfascia Muscle Bone Deepest
Thewayweareputtogether
Figure51,154
http://drinstitute.tripod.com/102JPEG.jpg
http://www.bartleby.com/
Theepidermis: isamultilayered,flexible,selfrepairingbarrier resistsabrasion,chemicals,andpathogens preventsfluidloss protectsdeeperstructuresfromUVradiation producesvitaminD3forcalcium&phosphorous absorption canprovidecluestobodyshealth
KEYCONCEPTS
Thedermis:
providesmechanicalstrength&flexibilityto epidermis,andprotectiontodeeperstructures ishighlyvascularized containsmanytypesofsensoryreceptors
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