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Spermatogenesis in the frog: Rana pipiens

(A) Testis of a recently metamorphosed frog.

(B) Similar to "A" except that the frog was previously treated with the anterior pituitary hormone to evacuate the seminiferous tubules, leaving only the interstitial tissue, spermatogonia, and a few primary spermatocytes. The post-breeding condition.

(C) High-power magnification of "A." (D) High-power magnification of "B."

(E) Testis of an August frog, showing all stages of spermatogenesis.

(F) Partially (pituitary) activated testis, similar to "E," showing released spermatozoa within the lumen, and all stages of spermatogenesis around the periphery of the seminiferous tubule.

(G) Testis of a hibernating, pre-breeding frog. Note the clusters of mature spermatozoa attached to single Sertoli cells. The lumen is filled with tails, few spermatogonia, and primary spermatocytes around the periphery of the seminiferous tubule.

(H) Testis of the male during amplexus, showing spermatozoa liberated into the lumen of the seminiferous tubule. (I) Collecting tubule of the frog testis full of mature spermatozoa, showing their origin from the connecting seminiferous tubules. Collecting tubules are lined with low cuboidal epithelium and are continuous with the vasa efferentia and the Malpighian corpuscles of the kidney.

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Pages where the terms "Historic" (textbooks, papers, people, recommendations) appear on this site, and sections within pages where this disclaimer appears, indicate that the content and scientific understanding are specific to the time of publication. This means that while some scientific descriptions are still accurate, the terminology and interpretation of the developmental mechanisms reflect the understanding at the time of original publication and those of the preceding periods, these terms, interpretations and recommendations may not reflect our current scientific understanding.     (More? Embryology History | Historic Embryology Papers)
Frog Development (1951): 1 Introduction | 2 Rana pipiens | 3 Reproductive System | 4 Fertilization | 5 Cleavage | 6 Blastulation | 7 Gastrulation | 8 Neurulation | 9 Early Embryo Changes | 10 Later Embryo or Larva | 11 Ectodermal Derivatives | 12 Endodermal Derivatives | 13 Mesodermal Derivatives | 14 Summary of Organ Appearance | 15 Glossary | 16 Bibliography | Figures


Rugh R. Book - The Frog Its Reproduction and Development. (1951) The Blakiston Company.

Cite this page: Hill, M.A. (2024, May 26) Embryology Rugh 017.jpg. Retrieved from

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© Dr Mark Hill 2024, UNSW Embryology ISBN: 978 0 7334 2609 4 - UNSW CRICOS Provider Code No. 00098G

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