About the fifth week of human embryonic life the tunica albuginea appears in the male, from which septa grow to divide the testis into lobules, while the epithelial cords form the seminiferous tubes, though these do not gain a lumen until just before puberty. [Please select]
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The seminiferous tubules of immature males are small, lack lumina, and contain a few large but inactive spermatogonia (Pl.) [Please select]
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1-5) begins in early May when a few spermatogonia appear in the seminiferous tubules. [Please select]
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A few spermatozoa and spermatids remain in the seminiferous tubules during hibernation. [Please select]
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1 to 5, respectively, are sections of seminiferous tubules obtained on May 17, June 14, July 15, Aug. [Please select]
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Spermatids appear in late June and a few of them undergo metamorphosis in early July; by mid-July, spermatids and secondary spermatocytes are the dominant cells in the seminiferous tubules, although spermatogonia are still active. [Please select]
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Sperm expelled from the epididymides in autumn matings are seemingly replaced by others from the seminiferous tubules; the epididymides become much smaller when their supply of sperm is nearly exhausted after spring mating. [Please select]
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