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XI-6 (5) Plastic section of seminiferous tubules (germinal epithelium) (H&E) in high power. Observe spermatogonia (adjacent to myoid cell layer), primary spermatocytes (large round nuclei) in various stages of prophase of first meiosis, early spermatids (small circular nuclei), and late spermatids (tadpole-shaped nuclei). Secondary spermatocytes are short lived and not seen. Sertoli cells are recognized in euchromatic ovoid nuclei with a prominent nucleolus. Interstitial cells of Leydig are also seen.