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Fk. 5 2 Dcx rlopmental stages in tho monkev te=!ti=! 



? To^lls of .1 96-(lav fetus Tul)ules aie shoit and stiaight. diametei is 60 to 70 /j. Oiih 

 Sertoli cells and a few spermatogonia are present in tubules. Sertoli cells are large and 

 fill the lumen. Intertubular spaces are wide and contain many cells, some epithelioid. 



3. Biopsy of testis at birth (174-day gestation). Tubular diameter is 60 to 80 fj.. Nuclei 

 of Sertoli cells are basal, and cytoplasmic strands fill tubular lumen. Spermatogonia are 

 sparse. Iiitertiil)ular tissue is abundant but imdifforentiated. 



