some of the events of mammalian fertilization that have been observed in living eggs and are reviewed herein include sperm penetration through the zona pellucida , contact of the fertilizing spermatozoon with the oocyte surface and the subsequent incorporation of the sperm head into the oocyte cytoplasm , the formation and disappearance of the incorporation cone , the gradual incorporation of the sperm flagellum , surface movements of the oocyte after activation , and the formation of the second polar body .
C0037868
spermatozoon
C0037844
the