vision bioguru视觉生物大师.ppt

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1、VisionPartsoftheEyeTheScleraTheCorneaConjunctivaTheChoroidCoatTheCiliaryBodyTheIrisThePupilTheRetinaTheMaculaluteaFoveaTheOpticNerveTheOpticDiskTheVitreousHumorTheAqueousHumorTheConjunctivalinestheinsideoftheeyelidsandcoversthesclera(whitepartoftheeye).Itiscompose

2、dofrarestratifiedcolumnarepithelium.TheScleraTheCorneaWindowoftheeyeHelpsfocusenteringlightraysComposedofconnectivetissuew/thinlayerofepitheliumHasmanynervefibersthatenterthemarginandradiatetowardthecenter–associatewithmanypainreceptorsw/lowthresholdColdreceptorsa

3、bundantWhiteportionoftheeyeMakesup5/6ofposterioroutertunicOpaqueb/cofhowthecollagenandelasticfibersarearranged.ProtectstheeyeAttachmentforextrinsicmusclesTheOpticNerveTheChoroidCoatLocatedinthebackoftheeyeAttachedtotheretinaTransmitsimagesfromtheretinatothebrainFl

4、ipsthepicturesPartofthemiddletunicPosterior5/6oftheglobeoftheeyeHasbloodvesselsthatnourishsurroundingpartsContainsmelanocytesMelaninfrommelanocytesabsorbexcesslightandkeeptheinsidepartoftheeyedarkTheCiliaryBodyTheIrisThickestpartofthemiddletunicExtendstothefrontfr

5、omthechoroidcoatFormsinternalringaroundtheeyeContainfoldscalledciliaryprocesses2groupsofmusclefibers–ciliarymusclesControlshowmuchlightenterstheeyeThindiaphragmcomposedofconnectivetissue&thinconnectivetissueItisthecoloredportionoftheeyeExtendsfromthefrontoftheperi

6、pheryintheciliarybodytothemiddleofthecorneaandthelensDividestheanteriorcavity(cornea&iris)intoanteriorchamber(irisandvitreoushumor)ThePupilTheLensThecircularopeninginthecenteroftheirisBlackspotinthecenteroftheirisControlshowmuchlightenterstheretinaItsdiametersisus

7、ually3-7mmTransparentHeldinpositionbyfiberscalledsuspensoryligaments(zonularfibers)fromtheciliaryprocessesLacksbloodvesselsLocatedbehindtheirisandthepupilComposedofspecialepithelialcellsVitreousHumorAqueousHumorFrontofirisandpupilWateryfluidcreatedbyepitheliumonin

8、nersurfaceofciliarybodySeparatedintoanteriorandposteriorchambersMaintainseyepressureNourishesfrontpartoftheeyeJelly-likefluidFillsthecentralcoreoftheeye