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Fertilisation - Anatomy & Physiology (view source)
Revision as of 17:53, 16 June 2010
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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>]]
== 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.
* Sperm nuclear membrane disappears.
* Sperm nuclear membrane disappears.
* Sperm '''nucleus decondenses'''.
* Sperm '''nucleus decondenses'''.
== Cortical Reaction - Block to Polyspermy ==
== Cortical Reaction - Block to Polyspermy ==