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Animal / Dairy Science 434 Testis Ram Boar Animal / Dairy Science 434! Testis! Lec 4: Comparative Male Anatomy! Species !Testis Wt. ! % Of !Orientation! ! ! (grams) !Body Wt.! !bull ! !300+ ! !.03 ! vertical! !ram ! !250 ! !.3 ! vertical! !boar ! !350 ! !.2 ! oblique! !stallion ! !200 ! !.03 ! horizontal! !dog ! ! 25 ! !.2 ! oblique! !rabbit ! 2.5 ! !.1 ! vertical! !human ! ! 25 ! !.03 ! vertical! Prostate! Rectum! Reproductive Cowpers Reproductive Seminal Vesicles! Gland! Organs of the Ampulla! Organs of the Bull! Bladder! Bull! Vas Deferens! Retractor Penis! Glans! Muscle! Penis! Sigmoid! Flexure! Caput Epididymis! Scrotum! Vertical Prepuce! Testis! Cauda Epididymis! Gubernaculum! Ram! Boar! Vertical Oblique Dog! Stallion! Horizontal Oblique Testis Orientation! Bull! Tail! Head! Human! Vertical Testis! Species !Testis Wt. ! % Of !Orientation! ! ! (grams) !Body Wt.! !bull ! !300+ ! !.03 ! vertical! !ram ! !250 ! !.3 ! vertical! !boar ! !350 ! !.2 ! oblique! !stallion ! !200 ! !.03 ! horizontal! !dog ! ! 25 ! !.2 ! oblique! !rabbit ! 2.5 ! !.1 ! vertical! !human ! ! 25 ! !.03 ! vertical! Seminal Ram! Pelvic Vesicles Urethral Muscle Ampulla Cowper’s Gland Prostate Bladder Seminal Cowper’s Gland Vesicles Vas Bulbospongiosus Deferens Muscle Prostate Vas No Ampulla! Bulbospongiosus Deferens No Body of the Prostate! Large Cowper"s! Muscle Pelvic Urethral Muscle Human! Prostate Seminal Cowper’s Gland Vesicles Ampulla No Disseminate! Prostate! No Disseminate! Bulbospongiosus Muscle Prostate! Pelvic Urethral Muscle Vas Deferens Dog Pelvic Tract! No Seminal Vesicles or Pelvic Disseminate Prostate Urethral Prostate Muscle Bladder Vas Deferens Bulbospongiosus Muscle Cat (Tom) Reproductive Tract! Cat (Tom) Cowper’s Gland Reproductive Vas Deferens Prostate Corpus Cavernosum Tract! Note how close the Crus Penis Glans Penis cowper’s gland is to the penis in the cat. Ampulla No Seminal Vesicles or Disseminate Prostate Feline Anatomy: Cat Glans Penis! Erection and Mating! Accessory Glands! Accessory Gland Secretions! Species !Seminal ! Prostate !Cowper's! Species Seminal Prostate Cowperʼs Vesicles Body+ Disseminate !Vesicles !body !disseminate! bull 30 6 ram 8 6 bull ! ++ ! + ! + ! ! +! boar 30 40 30 Gel! ram ! + ! - ! + ! ! ++ ! stallion Gel! 30 dog 70 boar ! +++ ! + ! + ! !+++! human 70 Clot! 25 Clot Enzyme! stallion ! +++ ! ++ ! - (+) ! ! +! dog ! - ! ++ ! - ! -! Cat ! - ! ++ ! - ! ! ++! human ! + ! ++ ! - ! ! +! Penis Types! Muscular-Vascular! Fibroelastic! Human Penis Cross Section! Blood Vessels Corpus Cavernosum Large Veins Urethra Corpus Spongiosum Internal! Urethral! Raphe! Comparison of Penis Types! Prepuce! Process! Stallion! Bull! Free End of Penis! Glans! Penis! Human! Filiform! Appendage! Ram! Cat! Boar! Human! Sigmoid Flexure! Boar! Bull! Fibroelastic Penis! Muscular- The Penis! Vascular Species Sigmoid Type Erectile Glans Penis Type! Flexure Tissue bull yes FE + Glans ram yes FE + Glans boar yes FE + not distinct stallion no MV +++ Large Glans dog no MV +++ Large Glans human no MV +++ Large Glans Stallion! Seminiferous! Erection and Ejaculation Tubule! Characteristics! !Species !Speed of !Ejaculate !Semen !Sperm !Sperm Primary! Spermatocyte! ! !Erection !Time !Volume !Conc. !Number! Spermatogonium! !bull !rapid !short !medium !medium- !medium ! ! ! ! !high! Sertoli Cells! Myoid Cells! » Support !ram !rapid !short !small !high !medium! spermatogenesis! Secondary! !boar !rapid !long !large !low !high! Spermatocyte! Leydig Cells! !stallion !slow !moderate !large !low !medium! » Testosterone Round Spermatids! !dog !slow !long !large !low !low! synthesis! Spermatids! human !slow !moderate !medium !low !low! Large Testes = high sperm numbers! Basement! Large accessory glands = large volume of the ejaculate with lower ! Membrane! concentration of sperm! Capillary! Seminiferous Tubules! Seminiferous Tubule! Interstitial Tissue (space) Capillary Leydig Cell Sertoli Cell! Sertoli Cell! Capillary! Leydig! Cells! Epididymis! Principal Cell! Basal Cell! Stereo-Cillia! Cauda Epididymis near Vas Deferens! Sperm! Smooth Muscle! Vas Deferens!.
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