penetration of the tracers in the degenerating seminiferous tubules was prevented by what appeared to be normal sertoli-sertoli junctions located between apposed sertoli cells , adluminal to the remaining spermatogonia when these resisted degeneration , or just adluminal to the basal lamina in those tubules in which spermatogonia were absent .
C0036630
seminiferous tubules
C0037866
spermatogonia