Biol Reprod Keystone Symposia Conference on Frontiers in Reproductive Biology & Regulation of Fertility.
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Biology of Reproduction, Vol 3, 265-274, Copyright © 1970 by Society for the Study of Reproduction

Ultrastructural Changes of the Nucleoli During Early Development of Fertilized Rat Eggs

ELSA B. SCHUCHNER 1

1 Centro de Investigaciones en Reproduccion, Universidad de Buenos Aires, Facultad de Medicina, Buenos Aires, Argentina


A study of the ultrastructural changes in the nucleoli of the fertilized rat egg during the first 90 hr of life has been made using both electron and light microscopy. Primary, secondary, and tertiary nucleoli of the pronucleus were identified as electron-dense, fibrillar bodies having specific locations and sizes. Extrusion to the cytoplasm of small as well as very large nucleolus-like bodies has been observed especially during the second half of pronuclear life.

Ultrastructural changes of these bodies during segmentation begin at the third and fourth day after fertilization. Small granular components appear in the periphery of the bodies. The particulate components grow in number during the fourth day while the fibrillar component diminishes.

These changes are discussed in relation to the functional activities of the nuclei during early development.

 Submitted on October 31, 1969






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Copyright © 1970 by the Society for the Study of Reproduction.