Figure 4

(A) Section of the germinal epithelium with multilayered spermatogonia. 52 years old infertile patient with arrest of spermatogenesis at the stage of spermatogonia. Drawing on the basis of a semithin section. × 600 (B) Arrest of spermatogenesis at the stage of A pale type-spermatogonia. 37 years old infertile patient with arrest of spermatogenesis at the stage of spermatogonia. Drawing on the basis of a semithin section. × 600 (C) Tumour cells in the basal compartment of the germinal epithelium dislocate a pale type-spermatogonia. 33 years old patient. Drawing on the basis of a semithin section. × 600 (D) Megalospermatocytes do not complete meiosis. 37 years old patient with impaired fertility. Drawing on the basis of a semithin section. × 600 (E) Arrest of spermatogenesis at the stage of primary spermatocytes. 34 years old patient with impaired fertility. Drawing on the basis of a semithin section. × 600 (F) Arrest of spermatogenesis at the stage of immature spermatids. 52 years old patient with impaired fertility. Drawing on the basis of a semithin section. × 600.