lecture 15-17 2011

lecture 15-17 2011 - MaleReproduction...

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Male Reproduction External cues, LHRH, FSH, LH Testes in birds Seasonal growth, regression, internal  location, high body temperature of birds, 1-3%  body weight Duct system for each testis Seminiferous tubules to  rete testis to efferent  ducts to connecting ducts to epididymal duct  (or epididymis) to deferent duct (or vas  deferens or ductus deferens
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The deferent duct ends with the papilla of  the ductus deferens in the urodeum of the  cloaca The cloaca has three regions: Coprodeum Urodeum  Proctodeum
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Accessory Organs Minimal in birds: no prostrate, seminal  vesicles, bulbourethra glands Most birds no copulatory organ that is  inserted into the female With limited accessory glands, only lymph  fluid added, so semen very concentrated  and small volume 
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Avian Male Accessory Organs Paracloacal Vascular Bodies: Dorsal Proctoadeal Gland: Foam production Possible function: ensures paternity Androgen dependent Estrogen Muscle contractions of cloacal sphincter muscle Lymphatic Folds
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Internal Anatomy of Testes 1) Interstitial tissue Nerves Leydig cells Myoid cells (a.k.a. Peritubular Contractile or  Myoepithelial cells)  
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Internal Anatomy of Testes
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Internal Anatomy of Testes 2) Basement membrane or basal lamina of  seminiferous tubule 3) Seminiferous Tubule Spermatogonium Developing sperm cells Sertoli cells Two regions of the tubule Basal compartment Apical compartment
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lecture 15-17 2011 - MaleReproduction...

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