Abstract
Abstract This article examines comparatively sperm‐egg interactions in different invertebrate groups with the aim of outlining common events and mechanisms, also in the light of our knowledge of these interactions in mammals. The moment when the gametes recognize each other and interact is now acknowledged as crucial for successful fertilization. Despite their apparent variability in different groups and species, a similar plan or organization of the structures involved in the interaction process can be recognized in all types of gametes so far studied. ,The oocyte is generally enclosed by an extracellular coat and another acellular or cellular envelope while the apical region of the sperm cell is characterized by an acrosomal apparatus which undergoes a series of changes on interaction with the oocyte. These changes enable the sperm to cross the external layer and fuse with the oocyte. A review of recent literature shows that the acrosome reaction is an event mediated by a ligand‐receptor interaction, th...
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