Vas deferens or Ductus deferens
VAS DEFERENS OR DUCTUS DEFERENS
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Vas deferens extends from tail of epididymis to colliculus seminalis of the pelvic urethra.
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It is a siphon shaped structure for the exit of spermatozoa.
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Vas deferens passes parallel to the testis into the spermatic cord through the inguinal canal and dorsomedially to the neck of the urinary bladder.
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It has uniform thickness up to the urinary bladder.
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Thickness is 3 mm in bulls and 6 mm in stallion.
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Blood supply: Internal pudic artery and spermatic artery.
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Nerve supply: Pelvic plexus.
![Vas deferens-Dog Vas deferens-Dog](http://14.139.56.154:82/file.php/189/Anatomy/Vas_Deferens.jpg)
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Ampulla
Terminal fusiform enlarged glandular portion of vas deferens is called as ampulla of the vas deferens
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Bull: Length – 10 -15 cm, Diameter – 1-1.5 cm
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Stallion: Length – 15-20 cm, Diameter – 2-2.5 cm
Ampulla is absent in dog and cat.
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It is smaller in boars.
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Ampulla lies dorsal to the urinary bladder and passes beneath the body of the prostate and opens in the round prominence into the pelvic urethra called as colliculus seminalis.
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Last modified: Tuesday, 12 June 2012, 4:23 AM