View source for Male Reproductive Anatomy - Donkey

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[[Image:Anatomy male donkey.jpg|left|thumb|200px|<small><center>Anatomy of the male urogenital organs: 1) kidney, 2) ureter, 3) urinary bladder, 4) ampulla of the vas deferens, 5) vesicular glands, 6) prostate, 7) vas deferens, 8) pelvic portion of the penis, 9) bulbo-urethral glands, 10) glans penis, 11) testis, 12) penile shaft. (Image courtesy of    [http://drupal.thedonkeysanctuary.org.uk The Donkey Sanctuary])</center></small>]]
[[Image:Internal genitals male donkey.jpg|right|thumb|200px|<small><center>Anatomy of the male internal genital organs: 1) vas deferens, 2) urinary bladder, 3) ampulla of the vas deferens,4) vesicular gland, 5) prostate, 6) bulbourethral gland. (Image courtesy of    [http://drupal.thedonkeysanctuary.org.uk The Donkey Sanctuary])</center></small>]]
[[Image:Testis exposed donkey.jpg|right|thumb|200px|<small><center>Medial (A) and lateral (B) view of the testis exposed by opening the vaginal tunic: 1) open vaginal tunic, 2) vas deferens, 3) pampiniform plexus, 4) caput (head) epididymis, 5) corpus
(body) epididymis, 6) testis, 7) cauda (tail) epididymis. (Image courtesy of    [http://drupal.thedonkeysanctuary.org.uk The Donkey Sanctuary])</center></small>]]
The '''reproductive organs of the jack are larger than a stallion’s.''' In the adult North African donkey, the bulbo-urethral gland’s length and width range from 2.8 to 3.5 and 3.5 to 5 cm respectively. The prostate measures 3.8 to 6 cm in length, 2.6 to 3.5cm in width and 1.6 to 2.5 cm in thickness. The vesicular glands (seminal vesicles) measure 5 to 13 cm in length and 2.5 to 4 cm in diameter. The ''ampullae'' of the ''vas deferens'' are 10 to 13.5 cm in length and 1.6 to 2.5 cm in diameter. During erection and ejaculation, the ''glans penis'' presents a more pronounced dilation. Video-endoscopic examination shows a more prominent ''colliculus seminalis''.

The '''scrotum is more pendulant''' and the testicles and epididymis are larger than in horses, but present similar ultrasonographic features. Testicular measurements for the most common breeds range from 6 to 7.5 cm for the height, 9 to 10.5 cm for the length and 4.8 to 6 cm for the width (Carluccio ''et al'', 2004; Tibary ''et al'', 2005). The epididymal tail is more prominent than that of the stallion.



[[Image:Testis in vaginal tunic donkey.jpg|left|thumb|200px|<small><center>Lateral (A) and medial (B) view of the testicle enclosed in its vaginal tunic: 1) cremaster, 2) testis, 3) cauda epididymis, 4) vas deferens. (Image courtesy of    [http://drupal.thedonkeysanctuary.org.uk The Donkey Sanctuary])</center></small>]]
[[Image:Scrotum donkey.jpg|center|thumb|400px|<small><center>External views of the scrotum. Note the pendulous scrotum in the lateral view (left) and the large, prominent cauda epididymis in the caudal view. (Image courtesy of    [http://drupal.thedonkeysanctuary.org.uk The Donkey Sanctuary])</center></small>]]





<big>'''[[Male urogenital ultrasound - Donkey|Click here]] to view ultrasound images of male urogenital organs.</big>


==References==

* Tibary, A., Sghiri, A. & Bakkoury, M. (2008) Reproduction In Svendsen, E.D., Duncan, J. and Hadrill, D. (2008) ''The Professional Handbook of the Donkey'', 4th edition, Whittet Books, Chapter 17


* Carluccio, A., Villani, M., Contri, A., Tosi, U., and Battocchio, M. (2004). ‘Preliminary study on some seminal and testicular morphometric characteristics in Martina Franca jackass’. ''Ippologia'' 15. pp 23-26.
* Tibary, A., Bakkoury, M., Anouassi, A., and Sghiri, A. (2005). ‘Examen et évaluation de l’aptitude à la reproduction’. ''Reproduction Equine Tome II: L’ Etalon.'' A. Tibary, M. Bakkoury (eds). Actes Editions, IAV Hassan II, Maroc, 2005. pp 167-174.




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