Themidgutofinsectconsistsofahighlyfoldedepitheliumthatrestsonamuscleandtracheaframework[1] .Thecellsoftheepitheliumarearrangedinacharacteristicpatterninwhichasinglegobletcellissurroundedby 3 -6columnarcells .Eachgobletcellispearshapedwithabasallylocatednucleus ,acentralcavity ,thegobletvesicle ,andasmoothapicalsurfacewhichjoinsthegobletvesiclethroughavalve .Columnarcellsappearascylindersinvivo ,withcentralnucleus ,basalinfoldingsofthecellmembraneandapi calmicrovilli[2 ] .Smallsphe......(论文页数是:3页) ,阿拉伯语论文,阿拉伯语论文范文 |