Animal/Dairy Science 434Lec 3:Male Reproductive Tract AnatomyLearning Objectives• To be able to describe the malereproductive system in the bull.– Structure– FunctionFactory• 1-25 X 109 sperm/day• “Plant” must be airconditionedWarehouse and Delivery• Storage 10-50 X 109 sperm• Sperm for 5-10 ejaculates• Smooth muscle contractionsupon sexual stimulationFinishing School• Fluid Absorption• 8-25 X 109 sperm– membrane changes– nuclear & flagellarstabilization– motility, fertility– cytoplasmic droplettranslocationDelivery System• Erection• Protrusion• EjaculationAlterations & Packaging• Metabolic substrates• Surface coatings• Transport for spermTestisEpididymisTail of EpididymisAccessory Sex GlandsPenisBullReproductiveTractReproductiveOrgans of theBullReproductiveOrgans of theBullTestisBull TestisTunica Vaginalis• parietal• visceralTunica AlbugineaBull TractScrotum• Thermosensor• Radiator• Protective sacBull TractCross SectionLongitudinal SectionScrotalCross Sectiontesticular parenchymamediastinumTestisTesticular ParenchymaMediastinumStructure ofthe TestisRete Testis(within the mediastinum)Tunica AlbugineaSeminiferous TubuleThe TestisMediastinumSeminiferousTubuleRete TestisStructure ofthe TestisRete Testis(within the mediastinum)Tunica AlbugineaSeminiferous TubuleStructure ofthe TestisVas Efferentia6-12 tubulesCaput EpididymisCauda EpididymisCorpusEpididymisVas DeferensSpermatic Cord• VasectomyStructure ofthe TestisRete Testis(within the mediastinum)Tunica AlbugineaVas Efferentia6-12 tubulesCaput EpididymisCauda EpididymisCorpusEpididymisSeminiferous TubuleVas DeferensSpermatic Cord• VasectomyPampiniformPlexusTesticularArterySpermatic ChordPampiniform Plexus• Counter Current Exchange 39°C - 34°C 70 ng T/ml - 4.8 ng T/ml• Vascular, lymphatic and nerves• Heat exchanger• Houses cremaster muscleTestis ArterialPulseSpermaticChordParietalTunicaVaginalisCremasterMuscleVas DeferensPampiniformPlexusBull TractTunica DartosContraction of the Tunica DartosTunica Dartos• Smooth muscle• Androgen dependent(Testosterone)TestisBull TractGubernaculumBull TractPelvic GenitaliaPelvic Genitalia of the BullPelvic UrethraMuscleBulb of the PenisReproductiveOrgans of theBullCowpersGlandCaput EpididymisCauda EpididymisTestisScrotumGlansPenisBladderAmpullaSeminal VesiclesProstateRectumVas DeferensGubernaculumSigmoidFlexureRetractorPenisMuscleCross Section of Bull PenisPenis Cross SectionCorpusCavernosumCorpusSpongiosumUrethraArterial SupplyGlans PenisGlans
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