Ultrastructural study on the primordial germ cells during embryonic development of Lacerta vivipara Jacquin
Hubert, J.
Zeitschrift für Zellforschung und mikroskopische Anatomie 107(2): 264-283
1970
ISSN/ISBN: 0340-0336 PMID: 5447678 Document Number: 5984
The primordial germ cells of Lacerta vivipara have relatively few free polysomes and little ergastoplasm. Smooth endoplasmic reticulum increases during embryonic development. The Golgi apparatus is well developed and lies close to the mitochondrial juxtanuclear cap. This study shows the ultrastructure of the ring-shaped nucleoli and the "masse paranucléolaire". Modifications in nucleolar structure are observed during embryonic development. Some ultrastructural features are probably related to the ameboid movement of the primordial germ cells. The physiological meaning of the ring-shaped nucleoli and the "masse paranucléolaire" is considered.
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