Abstract
The fine structure of differentiating male germ cells from primordial germ cells in the sexually differentiated testis to mature spermatozoa is described. Primordial germ cells are large and contain a highly lobate nucleus. On the basis of size, fine structure, and occurrence as individual cells, it is concluded that this cell type is found in the adult testis as well as in embryonic testes. An acrosomal vesicle of unusually large size is formed in the early spermatid stages. It is formed in close proximity with the base of the flagellum and later is found at the opposite end of the nucleus. It is postulated that nuclear rotation after acrosomal adhesion establishes the final polarity. The changing form and relationships between acrosome and nucleus are attributed in part to alterations of relative fluid pressures within the two organelles.
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