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Spermiogenesis and testicular spermatozoa of the olive baboon (Papio anubis).

The ultrastructure of spermiogenesis and of testicular spermatozoa of the olive baboon (Papio anubis) has been studied. The four main (Golgi, cap, acrosome and maturation) phases of spermiogenesis are described, and these phases have been further subdivided into a total of ten phases. Spermiogenesis was found to be basically similar to that of other mammalian species, in particular to that of man. A lower number of morphologically deviating cells was found in the baboon, but in other respects most differences between human and baboon spermiogenesis and spermatozoa refer to dimensions. Aspects of the morphogenesis of certain structures of the tail are discussed in more detail.