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Published byHollie Benson Modified over 9 years ago
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Fertilisation By Zoe Rees
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CORONA RADIATA ZONA PELLUCIDA PERIVETELLINE SPACE CELL MEMBRANE NUCLEUS HEAD MID-PIECE FLAGELLUM PROTECTIVE COATING NUCLEUS
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Capacitation The protective coating of PROTEINS and GLYCOPROTEINS is removed. This involves ENZYMES found in the uterus.
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The sperm is travelling towards the egg, surrounded by the CORONA RADIATA, a membrane.
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The sperm contracts the CORONA RADIATA which ruptures releasing PROTEASE ENZYMES The enzymes DIGEST the ZONA PELLUCIDA surrounding the oocyte.
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The sperm travels through the CORONA RADIATA and ZONA PELLUCIDA and into the PERIVETELLINE SPACE. INVERSION of the ACROSOME results in the formation of a NEEDLE- LIKE FILAMENT.
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The needle filament PIERCES the softened oocyte membrane, known as a ACROSOME REACTION. Allowing the head to penetrate. The entry of the head stimulates THICKENING of the ZONA PELLUCIDA which prevents the entry of other sperm known as POLYSPERMY.
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The entry of the head stimulates the completion of the SECOND MEIOTIC DIVISION of the OOCYTE NUCLEUS. The nuclei of the oocyte and the sperm FUSE together to form a DIPLOID CELL (ZYGOTE)
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