Formation and ultrastructure of the micropylar apparatus in Bombyx mori ovarian follicles

Journal of Morphology
Hideo Yamauchi, N Yoshitake

Abstract

The formation of the micropylar apparatus during oogenesis in the silkworm, Bombyx mori, has been studied using light and transmission electron microscopy. The micropylar apparatus is formed by three types of cells: the micropylar channel-forming cells (MCFCs), the micropylar orifice-forming cells (MOFCs), and the micropylar rosette-forming cells (MRFCs). During the formation of the vitelline membrane and the chorion, each of the MCFCs extends a cytoplasmic projection serving as the mold of a micropylar-channel into the egg envelopes. The detachment and collapse of the projections takes place at the end of choriogenesis. The micropylar channels possess a common external orifice on the chorion and several internal orifices within the vitelline membrane. The MOFCs interact closely with the MCFCs and contribute to the formation of the external micropylar orifice. A petal-like rosette surrounding the orifice is imprinted on the outer chorionic surface by the MRFCs which enclose a group of the MCFCs and MOFCs.

References

Jan 1, 1972·Zeitschrift für Zellforschung und mikroskopische Anatomie·M R Cummings
Jan 1, 1969·The Journal of Experimental Zoology·S B Pollack, W H Telfer
Jan 1, 1971·Tissue & Cell·D S SmithA C Neville

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Citations

May 1, 1991·Journal of Morphology·Flora E Zarani, Lukas H Margaritis
Aug 25, 2020·Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences·Sally Horne-Badovinac
Jan 7, 2017·The Journal of Experimental Biology·Kenji Matsuura
Jul 24, 2008·Development Genes and Evolution·Mariusz K JaglarzSzczepan M Bilinski
Nov 19, 2014·Proceedings of the National Academy of Sciences of the United States of America·Toshihisa Yashiro, Kenji Matsuura
Mar 1, 1991·Roux's Archives of Developmental Biology : the Official Organ of the EDBO·Flora E Zarani, Lukas H Margarifs
Dec 23, 2016·Biology Letters·Graziella IossaPaul E Eady
Nov 1, 1990·Roux's Archives of Developmental Biology : the Official Organ of the EDBO·Friedel WenzelDieter Zissler

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