title: The histology of the testis in aging and senile rats.
mesh_terms: D000375:Aging; D000818:Animals; D008297:Male; D051381:Rats; D012671:Seminiferous Tubules / Q000648:ultrastructure; D012708:Sertoli Cells / Q000648:ultrastructure; D013087:Spermatids / Q000648:ultrastructure; D013737:Testis / Q000648:ultrastructure*