DigestivetractLightCDarkCTasteporeTastebudfiliformandfungiformpapillae

（

HE）circumvallatedpapillae（HE）Tonguefoliatepapillae（HE）Foliatepapillae-tastebud（HE）Tastepore●mucousmembraneoftongueLingualpapillae:filiform,fungiform&circumvallated.Tastbud:darkC,lightC&basalC.Generalstructureofthewall

1.mucosa:epithelium:Laminapropria:Muscularismucosa:2.submucosa:3.Muscularis

externa:4.adventitia:Esophagus（HE）1Epi.2laminapropria3muscularismucosa4submucosa4esophagealglands5outerlongi

tudinalM5innercircularM6adven

titiaEsophagusEsophagealglandepitheliumEsophagus

1.mucosa:●Epi.:stratifiedsquamous.Non-keratinized●laminapropria:CT.●muscularismucosa:boudlesofSMC.longitudinal2.sbumucosa:esophagealglands,mucous.

3.muscularis:innercircular,outerlongitudinal

4.adventitia:

fibrosa.upper1/3:

skeletalM.middle:mixed.Lower1/3:smoothM.StomachfundusStomachmucosa:SimplecolumnarEpi.:

surfacemucouscellLaminapropria:

gastricpit,gastricglandsMuscularismucosa:innercircular,outerlongitudinal.submucosa:LCT.muscularis:

inneroblique,middlecircular,outerlongitudinal.

Adventitia:serosa.fundicglandslocation：lamina

propria1.ChiefC2.ParietalC3.NeckmucousC4.EndocrineC5.StemCcompositions：ChiefcellsLM:Lowercolumnar;basophilic;Nucleuslocatedinthelowerparts.Secretorygranules.EM:Gol,Apicalofthenucleus;mit.&rER,basalpartofcytoplasm;Secretorygranules,apicalof

cytoplasm.Function:

pepsinogenSecretorygranulenucleusrERParietalcellsLM:Clarge，cone-shaped

orround.acidophilic.Nucleusisround,centrical.EMIntrocellular

secretory

canaliculiµvilli.Tubulovesicularsystem.Mit.areabundant.functions:Hcl&intrinsicfactor.microvillinucleusIntrocellular

canaliculiMitochondriaduodenumileumjejunumsmallintestineCentrallactealSMCCap.Intestinalgland1absorbtive

C3Paneth

C2gobletC1striatedborder4endocrineC5stemCIntestinalvillimuscularissubmucosafoldsvilliadventitiamicrovilli（striatedborder）Smallintestinemucosa:Epi.:simplecolumnar,absorbtive

C+goblet

C.Laminapropria:smallintestinalgland,centrallacteal.Muscularismucosa:innercircular,outerlongitudinal.villi:thefinger-likeprocessescomposedofepitheliumlayerandlaminapropriaprotrudingintothelumen.submucosaTheduodenalgland,mucosa.Circularfolds:mucosa&submucosa

protrudingintothelumen.Appearsasprocesses.muscularis:innercircular,outerlongitudinal.adventitia:serosa.@@@@@smallintestinalglandAbsorbtive

CGoblet

CEndocrine

CStem

CPaneth

CLM:thebaseofgland.arrangedingroupsof3-5cells.

intheapex,coarseacidophilicgranules. EM:protein-secretingcell.functions:producelysozyme.LargeintestinalLaminapropriaMuscularismucosaEpi.Largeintestinalgland（gobletC）Mucosaoflargeintestine（HE）Largeintestinemucosa:novilli,nocircularfolds.SimplecolumnarEpi.:abundantgobletC.Laminapropria:largeintestinalglands,nopanethC.Muscularismucosa:appendixNovilli,intestinalglandIsscanty.Laminapropria:abundantLT.Serosa

SimpleColumnarGobletCabundantSimplecolumnarStriatedborderGobletCSimplecolumnarStriatedsquamousEpi.villusGastricpitsurfaceLargeintestineSmallintestinestomachesophagusThecomparisonsbetweenmucosaofvariantdigestivetract（1）esophagusstomachSmallintestineLargeintestineLaminapropriaNoglandsGastricglandSmallintestinalglandLargeintestinalglandNoLnoduleNoLnoduleL

noduleLnoduleabundantlactealFundicglandofstomach:chief,parietal,neckmucous,endocrine,stemC.Smallintestinalgland:absorbtive,goblet,paneth,endocrine,stemC.Largeintestinalgland:absorbtive,goblet,endocrine,stemC.Thecomparisonsbetweenmuc