Difference between revisions of "Avian Male Reproductive Tract - Anatomy & Physiology"
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* Dormant testes light brown/yellow in colour, turn white when sexually active. | * Dormant testes light brown/yellow in colour, turn white when sexually active. | ||
** In some psittacine species, immature or dormant testes may appear black due to melanocytes located in the interstitium. | ** In some psittacine species, immature or dormant testes may appear black due to melanocytes located in the interstitium. | ||
| − | + | * '''Semniferous tubules''' produce '''sperm''' from the epithelium. | |
| − | |||
| − | |||
| − | |||
* Interstitial '''Leydig cells''' lie between semniferous tubules. | * Interstitial '''Leydig cells''' lie between semniferous tubules. | ||
| + | * Tunical Albiguinea thinner thsn in mammals. | ||
| + | * '''No Pampiniform plexus'''. | ||
| + | * '''Epididymis is small and can be considered absent'''. '''Sperm maturation occurs in the Vas Deferens'''. | ||
| + | * Vas Deferens closely associated with the Ureter in the dorsomedial midline coelom, distinguished by its zig-zag appearance. | ||
| + | * Vas Deferens enters dorsal wall of the Urodeum. | ||
| + | * '''No accessory sex glands'''. | ||
== Phallus == | == Phallus == | ||
Revision as of 13:50, 4 July 2008
Testes
- Bean-shaped, paired
- Lie near the cranial pole of the kidney
- Medially, they lie close to the aorta and caudal vena cava.
- Each testical suspended by a short mesochorium and surrounded medially by the abdominal air sac.
- Left tends to be larger than right in immature birds.
- Dimentions increase rapidly with sexual activity.
- In the non-breeding season, testes shrink to almost nothing and become hard to visualize.
- Dormant testes light brown/yellow in colour, turn white when sexually active.
- In some psittacine species, immature or dormant testes may appear black due to melanocytes located in the interstitium.
- Semniferous tubules produce sperm from the epithelium.
- Interstitial Leydig cells lie between semniferous tubules.
- Tunical Albiguinea thinner thsn in mammals.
- No Pampiniform plexus.
- Epididymis is small and can be considered absent. Sperm maturation occurs in the Vas Deferens.
- Vas Deferens closely associated with the Ureter in the dorsomedial midline coelom, distinguished by its zig-zag appearance.
- Vas Deferens enters dorsal wall of the Urodeum.
- No accessory sex glands.