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An electron microscope study of the process of segmentation in the rabbit ova is described. During the first division cytoplasmic extrusions were observed, the contents of which appeared to pass into the perivitelline space. Vitelline inclusions were noted, as well as mitochondria with cristae which were positioned in an unusual manner. A well developed Golgi complex and several multivesicular bodies were also seen. During early cleavage annulate lamellae were observed inside the nucleus. The nucleolus changed from a dense homogeneous globular structure to a heterogeneous reticular structure. This change coincided with the appearance of large numbers of cytoplasmic polysomes. At the morula stage differences were noted in the density of the fundamental matrix between the various blastomeres. The significance of these developmental changes is discussed.

Ultrastructural Changes in Preimplantation Rabbit Embryos