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Sperm in the Female Tract - Anatomy & Physiology
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Revision as of 08:21, 8 September 2008
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08:21, 8 September 2008
→Acrosome Reaction
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== Acrosome Reaction ==
== Acrosome Reaction ==
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* Enables spermatozoa to penetrate the zona pellucida.
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* Exposes the equitorial segment, so it can later fuse with the oocyte plasma membrane.
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* The plasma membrane of the spermatozoon forms multiple fusion sites with the outer acrosomal membrane.
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* When the two membranes fuse, many small vesicles are formed, this is known as vesiculation.
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* After this has occured, acrosomal contents are dispersed and the sperm nucleus is left with the inner acrosomal membrane surrounding it.
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* Damaged acrosomes (sudden heating/cooling etc) do not vesiculate, but rupture all at once.
== Penetrating the Zona Pellucida ==
== Penetrating the Zona Pellucida ==
Lwilkie
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