Summary
The position of the oocyte nucleus within the ooplasm is fixed during the mid and late stages of house fly oogenesis. The germinal vesicle is located near the border of the nurse chamber, towards the periphery of the oocyte. The position of the anlage of the chorion raphe is strictly related to the germinal vesicle. As the raphe corresponds to the dorsal side of the later embryo, both the position of the oocyte nucleus and the raphe anlage in the follicular epithelium are early indicators of the dorsoventral axis of the house fly egg cell. In cross sections of the ovary the follicles are arranged in several concentric circles. The dorsal sides of all follicles within the ovary are oriented to an imaginary center. This center of orientation lies eccentrically near the medial part of the female abdomen. The resulting symmetrical pattern can be observed throughout the course of oogenesis. This implies that only a few follicles have the same dorsoventral orientation as the mother fly, and therefore this arrangement is contradictory to the imprinting hypotheses of body axis formation as well as to a possible inductive role of gravity.
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Kleine-Schonnefeld, H., Engels, W. Symmetrical pattern of follicle arrangement in the ovary of Musca domestica (Insecta, Diptera). Zoomorphology 98, 185–190 (1981). https://doi.org/10.1007/BF00312048
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DOI: https://doi.org/10.1007/BF00312048