Fig. 1. Schematic of Fertilization Events during Stages 1a and 1b |
A Sperm-oocyte membrane fusion and sperm incorportation into the oocyte cytoplasm. B Cortical and zonal reactions including exocytosis of cortical granules and interaction of their contents with the zona pellucida. C Extrusion of the second polar body. D Early pronuclear formation from the maternal and paternal chromosomes. |
CR, cortical reaction, FC, fertilization cone; FPn, female pronucleus; Ib, interbody; MPn, male pronucleus; PB1, first polar body; PB2, second polar body; SS, subzonal space; S, sperm head; Sp, maturation spindle; Z, zonal pellucida; ZR, zonal reaction. (From: Sathananthan, Trounson, and Wood, 1986. Reproduced with the permission of the publisher, Greenwood Publishing Group.) |
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