Abstract
Publisher Summary This chapter describes the structural, chemical, and functional changes of the egg plasma membrane as the results of gamete fusion and cortical granule dehiscence. There is a discussion on the investigations examining the fate of the sperm plasma and cortical granule membranes following their fusion with the egg plasmalemma. The fundamental mechanisms related to metabolic changes of the activated ovum are also reviewed. The processes related to aspects including dynamic changes of the egg cortex and secretory functions of cortical granules during fertilization are focused. The interactions and fusion of the sperm and egg, changes are initiated that affect virtually all components of the egg cortex. The egg plasmalemma becomes a mosaic composed of membranes derived from the egg and sperm, as well as from dehisced cortical granules. Membrane changes reflecting an integration of sperm and egg plasma membranes along the fertilization cone are demonstrated using tracers at the ultrastructural level of observation. The shunting of membrane from the egg surface in the form of endocytotic vesicles, to the Golgi complex, and lysosomes are demonstrated by tracer studies.
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