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1、组织学与胚胎学重点问答汇总(2)（SummaryofkeyquestionsandanswersinhistologyandEmbryology(2)）Thegeneralcharacteristics,classificationandfunctionofepithelialtissuearebrieflydescribed.1.generalfeatures:Manycells,dense,arrangedintolayers,withlessinterstitialcellsTherearepolarity(distinctsurfaceofcell
2、,structureandfunction).Itisdividedintofreesurface,basalsurfaceandlateralsurfaceGenerallynobloodvesselsThereareabundantnerveendings2.classification:epithelialtissueisdividedintocoveringepithelium,glandularepitheliumandsensoryepithelium3.functions:protection,absorption,secretionande
3、xcretionThegeneralcharacteristics,origin,function,andclassificationofconnectivetissue.1.generalfeatures:Therearefewercells,moremesenchymalcells,includingmesenchymalfibers,stromaandtissuefluid.Cellnon-polar,scatteredinthecloth.Thereareplentyofbloodvessels,Widelydistributedinvivo2.o
4、rigin:mesenchymeatembryonicstage3.functions:support,connection,nutrition,transportation,protection,defenseandrestoration3.classification:itcanbedividedintoproperconnectivetissue(looseconnectivetissue,denseconnectivetissue,adiposetissue,reticulartissue),cartilagetissueandbonetissue
5、andbloodThelightandelectronmicroscopicmorphologyofskeletalmusclefiberandcardiacmusclefiberwerecompared1)underlightmicroscope,theskeletalmusclefibersarelongcylindrical,withmanynucleiandflatovalshape.Theyarelocatedbelowthesarcolemma.Therearemyofibrilsinthecytoplasmwhichareparallelto
6、thelongaxisofthemusclefibersandhaveobviousstripes2)themyocardialfibersareshortcolumnarinlightmicroscope,andtherearebranchesandmeshintoeachother.Thenucleusismostlyoneovalandlocatedinthecenterofthecell.Thecytoplasmisrichandthestripesarenotobvious.Theintercalateddiscscanbeseenattheju
7、nctionofadjacentcells3)underelectronmicroscopeinskeletalmusclemyofibrilsbyalargenumberofthickfilamentsandthinfilamentsarranged;thetransversetubulesofhumanandmammalsinthelightanddarkbandjunction;sarcoplasmicreticulumdevelopedterminalcisterntransversetubulesandthesidesofthethreeCIS.
8、4)myocardialfibersintheelectronmi
