36 



REPRODUCTIVE SYSTEM OF THE ADULT FROG 



Meiot 

 division 





/«fw. 



♦*''^1«V'? 



Spermatozoa -l*^**^.. « // /^^-^ 



Spermatogonia^^** "^^Jf j-*t •^•' ' % . 



Sperm bundle Sertoli cell nucleus Interstitial tissue, 



[^'spermatocytes \ Tunica olbuginea Spermatozoa Low cuboidal epithelium; 



>*, 



jLumen\ Sertoli cell nuclei \ Spermatids \ Seminiferous 



Spermatids Spermatogonia ^'spermatocyte tubules 



Junction 



Collecting 

 tubule 



Spermatogenesis in the frog: Rana pipiens. (A) Testis of a recently metamor- 

 phosed frog. (B) Similar to "A" except that the frog was previously treated with 

 the anterior pituitary hormone to evacuate the seminiferous tubules, leaving only 



{Continued on facing page.) 



