Vision-GPC远景预测

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1、07Nov.2012Vision-lab.ppt1VisionEyeconvertselectromagneticradiation(light)toactionpotentialsImpulsescarriedoveropticnerves&optictractstoprimaryvisualcortex07Nov.2012Vision-lab.ppt2Eye:AccessorystructuresEyebrowEyelidsEyelashes07Nov.2012Vision-lab.ppt3Eye:Accessorystructur

2、esOrbicularisoculimusclecloseseyeConjunctivaMucousmembraneunderlidandoversurfaceofsclera07Nov.2012Vision-lab.ppt4Eye:AccessorystructuresLacrimalapparatusLacrimalglandExcretoryductsLacrimalpunctumLacrimalcanalNasolacrimalduct07Nov.2012Vision-lab.ppt5Eye:ExtrinsicMusclesSi

3、xmusclesaimeacheyeSuperiorrectusInferiorrectusMedialrectusLateralrectus(abducens)Superioroblique(trochlear)Inferioroblique07Nov.2012Vision-lab.ppt6EyeThreelayers(tunics)FibroustunicScleraCorneaVasculartunicChoroidCiliarybodyIrisSensorytunic=Retina07Nov.2012Vision-lab.ppt

4、7EyeAnteriorsegmentAqueoushumorsecretedbyciliarybodyDrainedthroughscleralvenoussinus(CanalofSchlemm)PosteriorsegmentVitreoushumor07Nov.2012Vision-lab.ppt8Eye:RefractionCorneaMorerefractionFixed(notfocusable)LensConnectedtociliarybodybysuspensoryligamentsChangesshapetofoc

5、usFlattenfordistanceThickenfornearvision07Nov.2012Vision-lab.ppt9Focusing,AccomodationLenschangesshapetofocusFlattenfordistanceThickenfornearvision07Nov.2012Vision-lab.ppt10RegulatingLightIntensityBrightlightstimulatesparasympatheticreflextoconstrictpupilsDimlightstimula

6、tessympatheticreflextodilatepupilsAtropine(Norepinephrinemimic)usedtodilatepupils07Nov.2012Vision-lab.ppt11EyeSensorytunic=RetinaExtensionofbrainOpticdiscAttachment,originofopticnerveCentralartery&veinMaculalutea&foveacentralis07Nov.2012Vision-lab.ppt12Eye:RetinaRetinabu

7、ilt“backwards”Lightpassesthrough3-4layersofcellsbeforereachingphotoreceptorsRetinalcellsGanglioncellsCellbodiesofopticnervefibersBipolarcellsRodsCones07Nov.2012Vision-lab.ppt13Eye:RetinaRodsRetinal+opsinrhodopsinAbsorbslightacrosswholevisualspectrumCan’tdistinguishcolor

8、SensitivetodimlightFewrodsinmaculaluteaMoreconcentratedinperipheralpartsofretina