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Fertilisation - Anatomy & Physiology (view source)
Revision as of 14:02, 13 August 2009
, 14:02, 13 August 2009→Fusion with the Oocyte
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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.
* Oocyte plasma membrane fuses with the '''equitorial segment''' and the fertilizing Spermatozoon is engulfed.
* 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 [[Copulation_-Sperm_in_the_Female_Tract_-_Anatomy_%26_Physiology|acrosome reaction]].
**Brought about by a fusion protein that is inactive prior to the [[Copulation_-Sperm_in_the_Female_Tract_-_Anatomy_%26_Physiology|acrosome reaction]].
* Nucleus of the Spermatozoon is within the Oocyte cytoplasm.
* Nucleus of the spermatozoon is within the oocyte cytoplasm.
* Sperm nuclear membrane disappears.
* Sperm nuclear membrane disappears.
* Sperm '''nucleus decondenses'''.
* Sperm '''nucleus decondenses'''.