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Ultrastructural Studies of Germ Cell Developments and Atypical Cells Occurred During Spermatogenesis in the Acini, and the Cyclic Changes in the Epithelial Cells With the Developmental Phases of the Seminal Vesicle in Rapana venosa (Valencienes)
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  • Journal title : The Korean Journal of Malacology
  • Volume 31, Issue 1,  2015, pp.9-19
  • Publisher : The Malacological Society of Korea
  • DOI : 10.9710/kjm.2015.31.1.9
 Title & Authors
Ultrastructural Studies of Germ Cell Developments and Atypical Cells Occurred During Spermatogenesis in the Acini, and the Cyclic Changes in the Epithelial Cells With the Developmental Phases of the Seminal Vesicle in Rapana venosa (Valencienes)
Lee, Il Ho; Chung, Jae Seung;
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 Abstract
Germ cell development and cyclic changes in the epithelial cells of the seminal vesicle of the male rapa whelk, Rapana venosa, were investigated by cytological and histological observations. The process of germ cell development can be classified into five stages: (1) spermatogonial, (2) primary spermatocyte, (3) secodary spermatocyte, (4) spermatid, and (5) spermatozoon. In particular, four atypical cells (Type IA, IB, IIA and IIB cells) occur among normal germ cells in the acini during spermatogenesis. Presumably, the atypical cells, which have lysosome-like vacuoles or lysosome-like bodies in the cells, are involved in breakdown and absorption themselves in the acini. However, atypical cells were not found in the epithelial cells of the inner layer of the seminal vesicle. A considerable amount of spermatozoa are transported from the testis towards the the seminal vesicles until late July. The main coupulation period is between June and July. The process of the cyclical changes of the seminal vesicles can be classified into three phases: (1) resting, (2) accumulating, and (3) spent. Yellow granular bodies are involved in resorption or digestion of residual spermatozoa.
 Keywords
Rapana venosa;germ cell development;atypical cells;seminal vesicle;
 Language
Korean
 Cited by
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