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| 文件类型: | 文章 |
|---|---|
| 所有的著者/提供者: | Stephen R Goldberg; William S Parker |
| ISSN: | 0018-0831 |
| OCLC号码: | 485214334 |
| 语言注释: | English |
| 注意: | Fig. 1.-Seminiferous tubules of Masticophis taeniatus and Pituophis melanoleucus. (A) 29 April, spermatogonia and Sertoli cells present, 250×. (B) 8 April, epididymis partially filled with sperm, 160×. (C) 22 April, ductus deferens packed with sperm, 160×. (D) 5 July, recrudescence in progress, primary, secondary spermatocytes and undifferentiated spermatids present, 400×. (E) 11 September, spermiogenesis; note sperm tails projecting into lumen, 250×. (F) 14 October, regressing testis; germinal epithelium reduced to one to two layers, 250×. (D) from P. melanoleucus, all others M. taeniatus. |
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摘要:
Testicular cycles of the colubrid snakes, Masticophis taeniatus and Pituophis melanoleucus are described. Testes are regressed April-May; recrudescence begins in June. Spermiogenesis occurs in both species during late summer-early autumn. ♂ ♂ emerge from hibernation in April with sperm from the previous autumn stored in the epididymis and ductus deferens. Breeding activity commences in April and continues into early summer. Sperm is present in the ductus deferens throughout the year. Interstitial cell nuclei diameters are at maximum sizes during autumn and spring. Minimum sizes were recorded in summer.
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添加标签 目的是为 "Seasonal Testicular Histology of the Colubrid Snakes, Masticophis taeniatus and Pituophis melanoleucus".
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