宽体金线蛭消化系统与生殖系统的组织学-研究

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1、●上海海洋大学硕士学位论文———————————-————————————————————————————————————————————一一_HistologyofDigestiveSystemandReproductiveSysteminWhitman&pigraABSTRACTWhitmaniapigrabelongstoAnnelida,Clitellata,Hirudinea，Euhirudinea，‘Arhynchobdellida，Hirudiniformes，Haemopidae，Whitmania．Thestructureofdigestivetra

2、ctandreproductivesystemofWhitmaniapigraweighing15-259wasstudiedbyanatomicalandhistologicalmethodsonthepurposeofprovidingthetheoreticalbasisondigestivephysiologyresearchandcultivation．Theresultsareasfollows：1．Theresearchondigestivetract(1)Thedigestivetractiscomposedoforalcavity,pharynx，e

3、sophagus，crop，intestine，rectumandanUS．PharynxwhichisattheendoforalcavityliesbetweenVIIsegmentandIXsegment．EsophaguslyingbetweenIXsegmentandXIIIsegmentisalongandnarrowtract．CroplyingbetweenXⅣsegmentandXXIIsegmentjoinsesophagusandintestine，andiscomposedoftrunkand1pairsoflateraldiverticulu

4、msoutstretchingfrombothsidesoftrunk；the6thlateraldiverticulumextendstothebothsidesofrectum．Intestineisstraight，narrowandshortrelatively,ofwhichthicknessofwallisapproximately220--910I．tmthickerthanthatofcrop．Rectumislongcomparatively,only3sectionsof”Z"-typefolder,andinflatedentirelyofwhi

5、chanteriorpartismoreinflatedthanposteriorpart；thethicknessofrectumwallis160-880I-tmapproximately．Anuswithouttractjoinswithrectum，andisformedbytheextremely‘shrinkingepitheliumofrectum．(2)Thestructureofdigestivetractwall．Pharynxiscomposedofmucosa,muscularisandtunicaadventitia,an．．dtunicaa

6、dventitiaCanbebarelyobserved．Thewall．ofesophagus，crop，intestineandrectumiscomposedofmucosa,submueosa，．muscularisandtunicaadventitia．Striatedbordercanbeobservedonthepharyngealandrectalepithelium．Theepitheliumismainlycomposedofcolumnarcellswithoutdevelopedciliaexcepttheintestinepart．Thegl

7、andsahdductsarelessobservedexcept●上海海洋大学硕士学位论文intestineandrectum．Themuscularismucosaofrectumiscomposedofinnercircularmuscleandouterlongitudinalmuscle，andthatofotherpartsareonlylongitudinal·muscles．Thesubmucosaisdevelopedcomparatively．Theboundarybetweentunicaadventitiawhichisse’