组织学与胚胎学英文实验讲义

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1、EPITHELIALTISSUEEPITHELIALTISSUEObjectives:Tograspthestructureofsimplesquamousepithelium,simplecuboidalepithelium,simplecolumnarepithelium,stratifiedsquamousepithelium.Tounderstandthestructureoftransitionalepithelium.Slide58SimpleSquamousEpithelium(Mesothelium)AgNO3T

2、hisisasurfaceviewofafrog’smesentery.Choosethinnerplacetoobserve,thecelllimitsarestainedblackwithAgNO3.Theindividualcellhashexagonalorirregularwavyoutlines,andeachcontainsanucleuswhichisnotshowninthisslide.Slide32SimpleSquamousEpithelium(Mesothelium)H.E.Thisisthecross

3、sectionofcolon.Intheoutmostlayer,mesotheliumwhichlikesalineispresent.Themesothelialcellsarefusiformwithdeep-stainedovoidnucleiincentre.Theoutlinesofthecellsarenotclear.Slide42SimpleCuboidalEpithelium(Thyroid)102H.E.Inthissection,therearemanyfolliclesinvarioussizes,wh

4、icharecomposedofsimplecuboidalepithelium.InthelumenEPITHELIALTISSUEofthefolliclecontainsredcoloredhomogenouscolloid.Theepithelialcellsappearasarowofsquareprofileswithroundnucleiincentre.Slide29SimpleColumnarEpithelium(duodenum)H.E.Thisisasectionoftheduodenum.Thereare

5、manyintestinalvilliwhicharefinger-likeprojectionsofmucosa.Thesurfaceofvilliarecoveredbythesimplecolumnarepithelium.Theepithelialcellsaremainlycomposedofcolumnarcellswhicharethetallrectanglecellswithelongatednucleioccupyingthebaseofthesecells.Amongthecolumnarcellsyouc

6、anfindsomeGobletcellswithadeep-stainedandtriangle-shapednucleus.Slide5PseudostratifiedCiliatedColumnarEpithelium（Trachea）H.E.Thisisaringoftransversallysectionedtreacheawithlargecentrallumen.Thethinbluish-purplecoloredlayerliningtheluminalsurfaceispseudostratifiedcili

7、atedcolumnarepithelium.Thisepitheliumappearsasmultilayeredbecauseofthe102presenceofnucleiattwolevels.Howeverallcellsrestonapinkbasementmembranewhichislocatedbetweenepitheliumandconnectivetissue,butsomeofthemdonotextendtotheluminalsurface.Theepitheliumconsistsof4typec

8、ells:Columnarcellsaretallwithovoidnucleiathighlevel.TheirEPITHELIALTISSUEfreesurfacepossessesregularcilia.Basalcellsaresmallestanda