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).

Invisible Viagara

Invisible Viagara

You are about to discover the "little-known" techniques, tricks and "mind tools" that will show you how to easily "program" your body and mind to produce an instant, rock-hard erection. Learn how to enjoy all of the control, confidence and satisfaction that comes from knowing you can always "rise to the challenge" ... and never have to deal with embarrassment, apologies, shyness or performance anxiety in the bedroom, ever again.

Get My Free Ebook

Post a comment