Difference between revisions of "Fertilisation - Anatomy & Physiology"

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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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Revision as of 14:48, 3 July 2008

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.
  • Nucleus of the Spermatozoon is within the Oocyte cytoplasm.
  • Sperm nuclear membrane disappears.
  • Sperm nucleus decondenses.


Electron Scanning Micrograph of Spermatozoa in the Uterine Horn. Copyright RVC 2008 (Courtesy of John Bredl (RVC))












Cortical Reaction - Block to Polyspermy

  • During the first and second meiotic divisions of Oogenesis small,dense cortical granules move to the periphery of the Oocyte cytoplasm.

Formation of Pronuclei