Animal / Dairy Science 434Lec 4: Comparative Male AnatomyTestisSpecies Testis Wt. % Of Orientation (grams) Body Wt.bull 300+ .03 verticalram 250 .3 verticalboar 350 .2 obliquestallion 200 .03 horizontaldog 25 .2 obliquerabbit 2.5 .1 verticalhuman 25 .03 verticalReproductiveOrgans of theBullCowpersGlandCaput EpididymisCauda EpididymisTestisScrotumGlansPenisBladderAmpullaSeminal VesiclesProstateRectumVas DeferensGubernaculumSigmoidFlexureRetractorPenisMusclePrepuceReproductiveOrgans of theBullVerticalRamVerticalBoarObliqueDogObliqueStallionHorizontalHumanVerticalTestis OrientationTailHeadBullTestisSpecies Testis Wt. % Of Orientation (grams) Body Wt.bull 300+ .03 verticalram 250 .3 verticalboar 350 .2 obliquestallion 200 .03 horizontaldog 25 .2 obliquerabbit 2.5 .1 verticalhuman 25 .03 verticalRamNo Body of the ProstateAmpullaSeminalVesiclesProstateBulbospongiosusMuscleCowper’sGlandBladderVasDeferensPelvicUrethralMuscleNo AmpullaLarge Cowper’sSeminalVesiclesBulbospongiosusMuscleCowper’s GlandVasDeferensPelvic Urethral MuscleProstateNo DisseminateProstateSeminalVesiclesBulbospongiosusMuscleCowper’s GlandVas DeferensPelvic Urethral MuscleProstateAmpullaHumanNo DisseminateProstateDog Pelvic TractProstateVasDeferensBladderPelvicUrethralMuscleBulbospongiosusMuscleNo Seminal Vesicles orDisseminate ProstateCat (Tom) Reproductive TractProstateCowper’s GlandGlans PenisCorpus CavernosumCrus PenisVas DeferensAmpullaNo Seminal Vesicles or Disseminate ProstateCat (Tom)ReproductiveTractNote how close thecowper’s gland is to thepenis in the cat.Cat Glans PenisFeline Anatomy:Erection andMatingAccessory GlandsSpecies Seminal Prostate Cowper'sVesicles body disseminatebull ++ + + +ram + - + ++boar +++ + + +++stallion +++ ++ - (+) +dog - ++ - -Cat - ++ - ++human + ++ - +Accessory Gland SecretionsSpecies SeminalVesiclesProstateBody+ DisseminateCowper!sbull 30 6ram 8 6boar 30 40 30stallion 30dog 70human 70 25GelGelClotClot EnzymePenis TypesMuscular-VascularFibroelasticHuman Penis Cross SectionCorpus CavernosumCorpus SpongiosumUrethraBlood VesselsLarge VeinsInternalPrepuceRapheUrethralProcessFree End of PenisGlansPenisFiliformAppendageBullRamBoarStallionHumanCatComparison of Penis TypesHumanSigmoid FlexureBullBoarFibroelastic PenisMuscular-VascularPenis TypeStallionThe PenisSpecies Sigmoid FlexureType Erectile TissueGlansbull yes FE + Glansram yes FE + Glansboar yes FE + not distinctstallion no MV +++ Large Glansdog no MV +++ Large Glanshuman no MV +++ Large GlansErection and EjaculationCharacteristicsSpecies Speed of Ejaculate Semen Sperm SpermErection Time Volume Conc. Numberbull rapid short medium medium- mediumhighram rapid short small high mediumboar rapid long large low highstallion slow moderate large low mediumdog slow long large low lowhuman slow moderate medium low lowLarge Testes = high sperm numbersLarge accessory glands = large volume of the ejaculate with lower concentration of sperm»Supportspermatogenesis»TestosteronesynthesisPrimarySpermatocyteSertoli CellsLeydig CellsCapillaryBasementMembraneSpermatidsRound SpermatidsSecondarySpermatocyteMyoid CellsSeminiferousTubuleSpermatogoniumSeminiferous TubulesSeminiferous TubuleSertoli CellSertoli CellLeydig CellCapillaryInterstitial Tissue (space)CapillaryLeydigCellsBasal CellPrincipal CellStereo-CilliaEpididymisCauda Epididymis near Vas DeferensVas DeferensSmooth
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