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[[Image:Fertilization histology.jpg|right|thumb|250px|<small><center> Electron Scanning Micrograph of Spermatozoa in the Uterine Horn.  Copyright RVC 2008 (Courtesy of John Bredl (RVC))</center></small>]]
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== Fusion with the Oocyte ==
 
== Fusion with the Oocyte ==
 
* When the spermatozoan completely penetrates the zona pellucida and reaches the perivitelline space, it settles into a bed of '''microvilli''' formed by the oocyte plasma membrane.
 
* When the spermatozoan completely penetrates the zona pellucida and reaches the perivitelline space, it settles into a bed of '''microvilli''' formed by the oocyte plasma membrane.
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* Sperm nuclear membrane disappears.
 
* Sperm nuclear membrane disappears.
 
* Sperm '''nucleus decondenses'''.
 
* Sperm '''nucleus decondenses'''.
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[[Image:Fertilization histology.jpg|right|thumb|250px|<small><center> Electron Scanning Micrograph of Spermatozoa in the Uterine Horn.  Copyright RVC 2008 (Courtesy of John Bredl (RVC))</center></small>]]
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== Cortical Reaction - Block to Polyspermy ==
 
== Cortical Reaction - Block to Polyspermy ==
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