欢迎来到天天文库
浏览记录
ID:19443672
大小:3.20 MB
页数:26页
时间:2018-10-02
《解剖学英文皮肤skin课件》由会员上传分享,免费在线阅读,更多相关内容在教育资源-天天文库。
1、TheIntegumentarySystemandBodyMembranesTHESKINStructure—twoprimarylayerscalledepidermisanddermisEpidermisOutermostandthinnestprimarylayerofskinComposedofseverallayersofstratifiedsquamousepitheliumStratumgerminativum—innerlayerofcellsthatcontinuallyreproduce;newcellsmovetowardthesurfaceAsc
2、ellsapproachthesurface,theyarefilledwithatough,waterproofproteincalledkeratin;eventuallycellsflakeoffStratumcorneum—outermostlayerofkeratin-filledcellsTHESKINSkinpigment—deepestepidermallayerisresponsibleforproductionofpigment,whichgivescolortotheskinThebrownpigmentmelaninisproducedbyspec
3、ializedcellsinthislayer(melanocytes)Dermal-epidermaljunction—specializedareabetweentwoskinlayersBlisterscancausedifthisjunctionisdamagedordestroyedTHESKIN(cont.)DermisDeeperandthickerofthetwoprimaryskinlayersandcomposedlargelyofconnectivetissueUpperpapillarylayerofdermischaracterizedbypar
4、allelrowsoftinybumpscalleddermalpapillaeRidgesandgroovesindermisformpatternuniquetoeachindividualBasisoffingerprintingImprovesgripfortooluseandwalkingTHESKIN(cont.)DermisDeeperreticularlayerofdermis:filledwithnetworkoftough,interlacing,collagenousandstretchableelasticfibersNumberofelastic
5、fibersdecreaseswithageandcontributestowrinkleformationDermisalsocontainsnerveendings,musclefibers,hairfollicles,sweatandsebaceousglands,andmanybloodvesselsTHESKIN(cont.)AccessorystructuresoftheskinHairSofthairoffetusandnewborniscalledlanugoHairgrowthrequiresepidermaltubelikestructurecalle
6、dhairfollicleHairgrowthbeginsfromhairpapillaHairrootlieshiddeninfollicleandvisiblepartofhaircalledshaftArrectorpili—specializedsmoothmusclethatproduces“goosebumps”andcauseshairtostandupstraightTHESKIN(cont.)Accessorystructuresoftheskin(cont.)ReceptorsSpecializednerveendings—makeitpossible
7、forskintoactasasenseorganTactile(Meissner’s)corpuscle/Merkelcell—capableofdetectinglighttouchClosetotheskinsurfacePacinicorpuscle—capableofdetectingpressureLocateddeepinthedermisFreenerveendings–painKrauseendbulbs(bulboidcorpuscles)–low-frequencyvibrationTHESKIN(con
此文档下载收益归作者所有