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J. Biophys. and Biochem. Cytol., Vol 3, 301-310, Copyright © 1957 by Rockefeller University Press

ARTICLE

ELECTRON MICROSCOPE STUDY OF THE VITELLINE BODY OF SOME SPIDER OOCYTES

J. Roberto Sotelo 1 and Omar Trujillo-Cenóz 1

1 From the Departamento de Ultraestructura celular, Instituto de Investigación de Ciencias Biológicas, Montevideo, Uruguay

The structure of the vitelline nuclei of Lycosidae and Thomisidae was described as follows: Vitelline nuclei are constituted of two parts: (a) a peripheral layer (vitelline body cortex), and (b) a central core. The vitelline body cortex is demonstrated to be formed by many cisternae of the endoplasmic reticulum among which mitochondria and Golgi elements are intermingled. The central core is made up mainly of a special type of body described under the name of "capsulated body." Capsulated bodies comprise a capsular layer, limited by a membrane, and two central masses called "geminated masses," each one limited by a double membrane. Irregular masses of closely packed vesicles are found in some cases among the capsulated bodies and free vesicles are present in large numbers.

The optical properties of the vitelline body cortex compared with the electron microscope findings lead us to the concept that this layer is a "composite body" according to Weiner's theory.

 Submitted on May 28, 1956


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