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Fertilisation - Anatomy & Physiology (view source)
Revision as of 14:39, 3 July 2008
, 14:39, 3 July 2008→Fusion with the Oocyte
== 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.
* Oocyte plasma membrane fuses with the '''equitorial segment''' and the fertilizing Spermatozoon is engulfed.
**Brought about by a fusion protein that is inactive prior to the acrosome reaction.
* Nucleus of the Spermatozoon is within the Oocyte cytoplasm.
* Sperm nuclear membrane disappears.
* Sperm '''nucleus decondenses'''.
== Cortical Reaction - Block to Polyspermy ==
== Cortical Reaction - Block to Polyspermy ==