Abstract
This chapter discusses the recent advances in the morphology, cytochemistry, and function of Balbiani's vitelline body in animal oocytes. The correlation of recent cytological, histochemical, and electron-microscope data has revealed that the Balbiani's vitelline body in oocytes of different animal species represents the aggregation of different organelles and inclusions of diverse morphology and nature. Therefore, it shows extreme variability in development, organization, and composition among different animal species. The nature of the factors causing these variations has not been determined, but genetic, physiological, and environmental factors perhaps influence its formation and differentiation. Depending upon the animal species or group, the Balbiani's vitelline body shows many combinations of various organelles and inclusions such as a yolk nucleus, mitochondria, Golgi bodies, annulate lamellae, multivesicular bodies, and lipid inclusions, which aggregate to a variable degree in the juxtanuclear cytoplasm.
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