Veterinary Andrology and Reproductive Techniques

VAS DEFERENS OR DUCTUS DEFERENS

• 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.
• Vas deferens passes parallel to the testis into the spermatic cord through the inguinal canal and dorsomedially to the neck of the urinary bladder.
• It has uniform thickness up to the urinary bladder.
• Thickness is 3 mm in bulls and 6 mm in stallion.
• Blood supply: Internal pudic artery and spermatic artery.
• Nerve supply: Pelvic plexus.

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Ampulla

Terminal fusiform enlarged glandular portion of vas deferens is called as ampulla of the vas deferens

• Bull: Length – 10 -15 cm, Diameter – 1-1.5 cm
• Stallion: Length – 15-20 cm, Diameter – 2-2.5 cm

Ampulla is absent in dog and cat.

• It is smaller in boars.
• 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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