《消化腺全英》PPT课件

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1、DigestiveSystemDigestiveGlandsComponentsdigestiveglandsfoundinthewallofdigestivetractaccessorydigestiveglands:salivaryglands/pancreas/liverGeneralstructure*Parenchyma(functionalportionofanorgan,asdistinguishedfromthesupportingtissue):acini/glandcellsduct*Stroma(unfunctionalp

2、ortionofanorgan):capsule,CTinside.Salivaryglands*Parotid*SubmandibularG.*SublingualG.Threetypesofacini*serous*mucous*seromucousFunction:*moisteningfood*carbohydratedigestion*SecreteIgAPancreaspositionedretroperitoneallyontheposteriorwalloftheabdominalcavityatthelevelofthesec

3、ondandthirdlumbarvertebrae.nodistinctcapsule,butiscoveredbyathinlayerofLCTbothanexocrine&endocrinegland.*exocrinepart:producespancreaticjuice*endocrinepart:producehormonesComponentsoftheexocrinepancreasconsistsofserousglandsacinifilledwithacidophiliczymogengranulesintercalat

4、edductextendsintothecentreoftheacini,whichislinedbycentroacinarcellsductsystem:intercalatedducts(lowcolumnarorcuboidalepith.)Interlobularducts(columnarepith.)Mainpancreaticducts(tallcolumanrepth.)majorduodenalpapillaFunctionofpancreaticjuice:*Trypsin,chymotrypsin&carboxypept

5、idasehydrolyseproteins;*ribonuclease&deoxyribonucleasesplitnucleicacids;*amylasehydrolysesstarch&glycogen*lipasehydrolysestriglyceridesintofattyacidsandmonoglycerides*cholesterolesterasebreaksdowncholesterolestersintocholesterolandafattyacid.ComponentsoftheEndocrine*Islandso

6、fLangerhansscatteredthroughouttheexocrinepancreas.*Vascularization(manyfenestratedcap.)ismoreextensivethanthatoftheexocrineacini.*ThreedifferenttypespresentA-cells(20%):glucagonproducerB-cells(75%):insulinproducerD-cells(5%):somatostatinproducerLiver*largestgland(~2%ofbodywe

7、ightinadult).*receivesbothvenous&arterialbloodthroughtheportalV.(~75%)&hepaticA(~25%),respectively.*CTofcapsuleextendedintotheparenchyma,forming“classical”liverloblules(basicstructureunits).*functionsasanexocrinegland(secretingbile).Structuresofliverlobules*six-sidedprismwit

8、hacentralV.atitscentre*delimitedbyinterlobularCT*portaltriadsinthecornerofl