组织学自我测试题第十五部分

SELF-ASSESSMENTINHISTOLOGYQUESTIONS十五,MALEREPRODUCTIVESYSTEM1Eachtestisisencapsulatedbyadensefibrousconnectivetissuelayercalledthetunicavaginalis.(F)2Eachtestisisdividedintoapproximately50lobuleseachcontainingaseminiferoustubule.(F)3Theepididymisextendsuptheposterioraspectofthetestisandatitsupperpolebecomescontinuouswiththeductusdeferens.(F)4Seminiferoustubulesdrainintotheretetestisfromwhichspermatozoapasstotheepididymisviatheductuliefferentes.(T)5Spermatogenesisistheprocessofmalegameteformation,whereasspermiogenesisisthetransformationofmalegametesintomaturespermatozoa.(T)6Duringthefirstmeioticdivision,eachchromosomedividesatthekinetochoretoform2chromatidswhichmigratetooppositepolesofthecell.(F)7Chiasmaformationoccursduringthefirstmeioticdivisiongametogenesis.(T)8Betweenthefirstandseconddivisionsofmeiosisthechromosomesundergoduplication.(F)9Inthemale,meiosisresultsintheformationoffourhaploidgametesfromeachdiploidgermcell.(T)10Inthemale,primitivegermcellsmultiplycontinuouslybymitosisthroughoutadultlife.(T)11Inmales,primitivegermcellsarereferredtoasspermatocytes.(F)12Primaryspermatocytesarerecognisedbytheircharacteristicnucleiwhicharesmall,condensedandintenselystained.(F)13Whenthesecondmeioticdivisionofspermatogenesisiscompleted,theresultingcelltypeisknownasaspermatid.(T)14Spermiogenesisischaracterisedbyprogressivecondensationofthenucleusanddiminutionofcytoplasmicvolume.(T)15Intheseminiferoustubule,cellsofthespermatogenicseriesaresupportedbyspecialisedepithelialcellsknownasSertolicells.(T)16Sertolicellsarerecognisedinlightmicroscupybytheirlargetriangularorovoidnucleiexhibitingprominentnucleoli.(T)17Ultrastructurally,theSertolicellcyroplasmischaracterisedbyextensiveroughendoplasmicreticulum.(F)18Sertolicellsareusuallyfoundintheinterstitialspacesbetweenseminiferoustubules.(F)19Duringspermiogenesis,theacrosomalheadcapdevelopsfromavesiclederivedfromtheGolgiapparatusofthespermatid.(T)20Theacrosomalheadcapofthematurespermatozooncontainshydrolyticenzymeswhichareresponsiblefordegradingredundantcytoplasmicconstituentsresultingfromspermiogenesis.(F)21Inhumans,maturespermatozoaareapproximately65μminlength.(T)22Reflectingtheintenseenergydemandsofflagellaractivity,theneckofthematurespermatozooncontainsnumerousmitochondria.(F)23Theprincipalpieceisthelongestsegmentofthetailofthespermatozoon.(T)24Theaxonemeofaspermatozoonhasasimilararrangementofmicrotubulesasinthebasalbodyofacilium.(F)25Inthesemenofnormaladulthumanmales,upto25percentofspermatozoaareabnormalordegenerateinform.(T)26Leydigcellsaresteroid-secretingcellsfoundintheinterstitialspacesbetweenseminiferoustubules.(T)27ThesecretoryactivityoftesticularinterstitialendocrinecellsismainlycontrolledbythepituitaryhormoneFSH.(F)28Testicularinterstitialendocrinecellsarecharacterisedultrastructurallybyextensivesmoothendoplasmicreticulum,lipiddropletsandmitochondriawithtubularcristae.(T)29Removalofthepituitaryglandfromamaturemaleresultsinanincreaseinthenumberoftesticularinterstitialendocrinecells.(F)30Androgenhormonesareanessentialrequirementfornormalproductionofspermatozoa.(T)31Theretetestisislinedbystratifiedcuboidalciliatedepithelium.(F)32Theductuliefferentesarelinedbyasimpleepithelium,somecellsofwhichareciliated.(T)33Theepididymisconsistsof25to30convolutedtubuleswhichconvergeuponthefirstpartoftheductusdeferens.(F)34Spermatozoaacquiremotilityduringtheirpassagethroughtheepididymisislinedbyapseudo-stratifiedepitheliumwhichpossessesstereocilia.(T)35Theepididymisislinedbyapseudo-stratifiedepitheliumwhichpossessesstereocilia.(T)36Theductusdeferenshasathinmuscularwallwhichisinnervatedbytheparasympatheticnervoussystem.(F)37Theductusdeferensislinedbyepitheliumsimilartothatoftheepididymis.(T)38Theseminalvesiclesstorelargequantitiesofspermatozoapriortoejaculation.(F)39Theseminalvesiclessecreteanalkalinefluidcontainingfibrinogen,vitaminCandfructose.(T)40Thesmoothmuscleoftheseminalvesclescontractsundertheinfluenceofthesympatheticneroussystemduringejaculation.(T)41Oneachside,theseminalvesiclejoinstheductusdeferenstoformtheejaculatoryductwhichopensintotheurethraatapointjustdistaltotheprostategland.(F)42Prostaticsecretion,whichcomprisesthebulkofseminalfluid,isrichincitricacidandfibrinolysin.(T)43Prostaticglandularepitheliumisofthepseudostratifiedcolumnarciliatedtype.(F)44Corporaamylaceaandprostaticconcretionsbecomeamorecommonfeatureoftheprostateglandwithincreasingage.(T)45Thewalloftheprostaticurethracontainsacircularlayerofsmoothmusclewhichconstitutesthesphincterurethrae.(F)46Exceptattheurethralmeatus,themaleurethraislinedbytransitionalepithelium.(F)47Theerectiletissueofthepenisisarrangedasthreecavernousbodieseachinvestedbydensefibro-elasticconnectivetissue.(T)48Intheerectpenis,theso-calledhelicinearteriesfollowaspiralcourse.(F)49Erectionofthepenisisinitiatedbydilatationofthearteriessupplyingthecaveernousbodiesundertheinfluenceoftheparasympatheticnervoussystem.(T)50Thebulbo-urethralglandsofCowperareacinarglandswhichproduceamucinouslubricantforthepenileurethrapriortoejaculation.(T)