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Quarterly Journal of Microscopical Science, Vol s3-105, 475-480, Copyright © 1964 by Company of Biologists

The Histochemistry and Fine Structure of the Accessory Nuclei in the Oocyte of Bombus terrestris

C.R. HOPKINS 1

1 Zoology Department, University College of Swansea, Singleton Park, Swansea

The accessory nuclei are present throughout vitellogenesis in the peripheral ooplasm; they probably originate from the oocyte nucleus. Structurally they resemble nuclei and in addition their electron-dense inclusions contain RNA, possibly of nucleolar origin. They do not, however, contain chromosomal material.

During development they increase in size and multiply by equal division or by a form of terminal budding.

They do not become transformed into albuminous yolk spheres but are probably concerned with the control of albuminous yolk synthesis at the periphery of the oocyte. They remain after the termination of yolk synthesis and are associated with the formation of the vitelline membrane.






© The Company of Biologists Ltd 1964