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Quarterly Journal of Microscopical Science, Vol s3-103, 141-145, Copyright © 1962 by Company of Biologists

Extrusion of Nuclear Material During Oogenesis in Blatta Orientalis

R.A. R. GRESSON and L. T. THREADGOLD 1

1 Department of Zoology, The Queen's University of Belfast, Northern Ireland, and the Department of Anatomy, Dalhousie University, Halifax, Nova Scotia, Canada)

That nucleolar material is extruded to the cytoplasm of the young oocyte of Blatta orientalis is confirmed by means of electron microscopy. The nucleolus and nucleolar extrusions are shown to contain RNA. In addition to the nucleolar extrusions, vesicle-like structures originate in the nuclear membrane and from there pass into the cytoplasm where they become indistinguishable from elements of the endoplasmic reticulum. When the nucleolar extrusions reach the cytoplasm they increase in size, come into close association with a few mitochondria, and migrate towards the periphery of the cell. It is concluded that the emission of material from the nucleolus and the passage of vesicles from the nuclear membrane to the cytoplasm are necessary prerequisites for the process of vitellogenesis.






© The Company of Biologists Ltd 1962