ReproductionMale Reproductive SystemGamete ProductionPendulous TestesScrotumLow InsulationMusculatureVascularizationVaricoceleScrotum NervesTestisTunica albugineaTestis StructureSeminiferous TubulesSlide 15Slide 16Slide 17Slide 18Spermatogenesis & Androgen Production Stimulated by BrainSlide 20Interstitial (Leydig) CellsSlide 22Slide 23Slide 24Testosterone LevelsSlide 26Slide 27Sertoli CellsSperm PathRete TestisMale Reproductive TractEpididymisSlide 33Slide 34Tunica VaginalisVas DeferensSlide 37Spermatic CordSlide 39Inguinal CanalTestis TorsionSlide 42Accessory GlandsSlide 44Seminal VesicleProstateSlide 47Prostate CancerSlide 49Slide 50Bulbourethral GlandSlide 52PenisCorpora CavernosaSlide 55Slide 56Slide 57Sinusoids & TrabeculaeRich Blood SupplyErectile TissueSlide 61ViagraViagra Health RisksCold ShowerCorpora SpongiosumHouses Penile UrethraPrepuce2300 BCSlide 69Male-female ComparisonSlide 71Slide 72Coolidge EffectSlide 74Testicular CancerSlide 76Slide 77Slide 78Slide 79Slide 80Genital End-Bulb NervesPudendal Nerve StimulatorSlide 83ReproductionReproductionChapter 27Chapter 27Male Reproductive SystemMale Reproductive SystemReproductive organsReproductive organsTestisTestisScrotumScrotumReproductive tractReproductive tractEpididymisEpididymisVas DeferensVas DeferensSpermatic cordSpermatic cordAccessory glands & organsAccessory glands & organsSeminal vesiclesSeminal vesiclesProstate glandProstate glandBulbourethral glandBulbourethral glandPenisPenisGamete ProductionGamete ProductionTestesTestesSpermatozoa (sperm)Spermatozoa (sperm)~100-300 million/ day~100-300 million/ dayProduction begins at pubertyProduction begins at pubertySpermatogenesis- VERY temperature Spermatogenesis- VERY temperature sensitivesensitiveOptimal temperature ~3-4C below body tempOptimal temperature ~3-4C below body tempPendulous TestesPendulous TestesScrotumScrotumBi-chambered external pouch of skinBi-chambered external pouch of skinFunctionFunctionHouses testesHouses testesProtects testesProtects testesRegulates testicular temperatureRegulates testicular temperatureScrotum modifications for temperature regulation & Scrotum modifications for temperature regulation & protection protection Low insulation- sparse hair & thin skinLow insulation- sparse hair & thin skinSweat glandsSweat glandsVascularization- countercurrent blood flowVascularization- countercurrent blood flowMusculatureMusculatureEnnervationEnnervationLow InsulationLow InsulationLittle insulating fat Little insulating fat Sparce hairSparce hairSweat glandsSweat glandsMusculatureMusculatureDartos muscle (tunic)Dartos muscle (tunic)Muscle inserting into scrotal skinMuscle inserting into scrotal skinContraction tenses skin of scrotum & Contraction tenses skin of scrotum & raises testisraises testiswrinklingwrinklingCremaster muscleCremaster muscleSurrounds testisSurrounds testisContraction pulls testis closer to Contraction pulls testis closer to bodybodyCold- contractionCold- contractionWarm- relaxationWarm- relaxationVascularizationVascularizationPampiniform plexusPampiniform plexusCountercurrent blood flowCountercurrent blood flowCool venous blood surrounds Cool venous blood surrounds incoming arteriesincoming arteriesActively cools incoming blood & Actively cools incoming blood & warms outgoing bloodwarms outgoing bloodTestes always surrounded by Testes always surrounded by cool bloodcool bloodTestesVaricoceleVaricoceleMost common curable Most common curable cause of infertility cause of infertility Equivalent of varicose Equivalent of varicose veins veinsScrotum NervesScrotum NervesBehavioral protectionBehavioral protectionTestisTestisPaired gonads inside of Paired gonads inside of scrotumscrotumSurrounded by tunicSurrounded by tunicTunica albugineaTunica albugineaFunctionFunctionSpermatogenesis- sperm Spermatogenesis- sperm formationformationHormone productionHormone productionAndrogens- testosteroneAndrogens- testosteroneTunica albugineaTunica albuginea“White Coat”Testis StructureTestis StructureSeminiferous tubulesSeminiferous tubulesSertoli cellsSertoli cellsRete testisRete testisInterstitial (Leydig) cellsInterstitial (Leydig) cellsSeminiferous TubulesSeminiferous TubulesActual site of spermatogenesisActual site of spermatogenesis800+ coiled tubes800+ coiled tubesMaximizes surface areaMaximizes surface areaBulk of testes tissueBulk of testes tissueSpermatogenesis & Androgen Spermatogenesis & Androgen Production Stimulated by BrainProduction Stimulated by BrainInterstitial (Leydig) CellsInterstitial (Leydig) CellsLocated between seminiferous tubulesLocated between seminiferous tubulesSite of androgen productionSite of androgen productionSurrounded by capillariesSurrounded by capillariesStimulated to produce by increased levels Stimulated to produce by increased levels of testosterone by Leuteinizing Hormoneof testosterone by Leuteinizing HormoneInterstitial (Leydig) CellsInterstitial (Leydig) CellsInterstitial (Leydig) CellsInterstitial (Leydig) CellsTestosterone LevelsTestosterone LevelsTestosterone LevelsTestosterone LevelsTestosterone LevelsTestosterone LevelsSertoli CellsSertoli CellsLots tight junctions in Lots tight junctions in cells near basement cells near basement membranemembraneForm blood testes Form blood testes barrierbarrierProtects from Protects from pathogens, mutagens, pathogens, mutagens, immune cellsimmune cellsSperm PathSperm PathMale reproductive tract continuous- Isolates spermRete TestisRete TestisLocated within the testisLocated within the testisSite of merging Site of merging seminiferous tubules seminiferous tubules exiting from testesexiting from testesCommon pathway for Common pathway for exiting spermexiting spermMale Reproductive TractMale Reproductive TractEpididymisEpididymisTesticular capTesticular capSingle coiled tubuleSingle coiled tubule6M long6M longReceives sperm from rete testisReceives sperm from rete testisFunctionFunctionSecretes/absorbs nourishing fluidSecretes/absorbs nourishing fluidRecycles damaged spermatozoaRecycles damaged spermatozoaStores spermatozoaStores spermatozoaUp to 2 weeksUp to 2 weeksAllows time for maturationAllows time for maturationEpididymisEpididymisEpididymisEpididymisTunica VaginalisTunica VaginalisSurrounds testes &