Morphological development of testes in ostrich (Struthio camelus) embryo

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• 作者：Belal Hassanzadeh (1)
  Abolghasem Nabipour (1)
  Morteza Behnam Rassouli (2)
  Hesam Dehghani (1) (3)
  
• 关键词：Ostrich embryo ; Primordial germ cells ; Rete ducts ; Seminiferous tubules ; Tunica albuginea
• 刊名：Anatomical Science International
• 出版年：2014
• 出版时间：June 2014
• 年：2014
• 卷：89
• 期：3
• 页码：129-139
• 全文大小：
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• 作者单位：Belal Hassanzadeh (1)
  Abolghasem Nabipour (1)
  Morteza Behnam Rassouli (2)
  Hesam Dehghani (1) (3)
  
  1. Department of Basic Science, Faculty of Veterinary Medicine, Ferdowsi University of Mashhad, Mashhad, Iran
  2. Department of Biology, Faculty of Science, Ferdowsi University of Mashhad, Mashhad, Iran
  3. Embryonic and Stem Cell Biology and Biotechnology Research Group, Research Institute of Biotechnology, Ferdowsi University of Mashhad, Mashhad, Iran
  
• ISSN：1447-073X

文摘

Although the histological structure of ostrich testis has been studied, very little information is currently available on the embryonic development of this organ. The aim of this study was to determine the sequence of the histological changes in diverse components of the testis in ostrich embryo from embryonic day (E) 20 to E42. The main findings were categorized into four histological features, i.e., development of sex cords, interstitial tissue and rete ducts, and the appearance of defective septa. While the lumen of sex cords, tunica albuginea, capsular rete ducts and Leydig cell precursors appeared at E26, the filum-shaped defective septa were visible at E36. The emersion of the lumen in the primary sex cords and formation of capsular rete ducts in the ostrich embryo is considerably different from that in other birds. However, tunica albuginea and Leydig cell precursors appeared in a similar pattern to those of other birds. An interesting observation was that the primordial germ cell (PGC)-like cells were completely distinct, while the capsular rete ducts were formed by trapping of some Sertoli cell aggregations in the tunica albuginea. This suggests that similar to the primary sex cords, the capsular rete ducts may originate from the Sertoli cell aggregations which had corralled some PGCs. Stereological estimations in the ostrich embryo testis showed the major proportion of testis is occupied by the seminiferous tubules, which is unlike the fowl embryo testis.