Prepubertal Proliferation of Spermatogonia

The ontogeny of the spermatogonia in primates has not been investigated as completely as that of the Sertoli cells (57-60). Within the first days of life, the only germ cells observed in the rhesus monkey are type A spermatogonia, which are morphologically indistinguishable from the type A spermatogonia found in the adult testis (57). The number of type Ad and Ap spermatogonia increases with age, and, as in the case of Sertoli cells, the major increases occur during puberty and may result from the increase in gonadotropins (57).

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