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Fertilisation

Fertilisation. By Zoe Rees. FLAGELLUM. MID-PIECE. NUCLEUS. HEAD. PROTECTIVE COATING. CORONA RADIATA. PERIVETELLINE SPACE. ZONA PELLUCIDA. CELL MEMBRANE. NUCLEUS. Capacitation.

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Fertilisation

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  1. Fertilisation By Zoe Rees

  2. FLAGELLUM MID-PIECE NUCLEUS HEAD PROTECTIVE COATING CORONA RADIATA PERIVETELLINE SPACE ZONA PELLUCIDA CELL MEMBRANE NUCLEUS

  3. Capacitation The protective coating of PROTEINS and GLYCOPROTEINS is removed. This involves ENZYMES found in the uterus.

  4. The sperm is travelling towards the egg, surrounded by the CORONA RADIATA, a membrane.

  5. The enzymes DIGEST the ZONA PELLUCIDA surrounding the oocyte. The sperm contracts the CORONA RADIATA which ruptures releasing PROTEASE ENZYMES

  6. INVERSION of the ACROSOME results in the formation of a NEEDLE-LIKE FILAMENT. The sperm travels through the CORONA RADIATA and ZONA PELLUCIDA and into the PERIVETELLINE SPACE.

  7. 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.

  8. The nuclei of the oocyte and the sperm FUSE together to form a DIPLOID CELL (ZYGOTE) The entry of the head stimulates the completion of the SECOND MEIOTIC DIVISION of the OOCYTE NUCLEUS.

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