Egg membranes There are 3 types of egg membranes:

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Presentation transcript:

Egg membranes There are 3 types of egg membranes: Primary egg membrane:Formed by the egg itself inside the ovary ; eg. Zona pellucida in mammals and chorion in insects. Secondary egg membrane: Formed by the ovarian tissue before the egg leave the ovary. Tertiary egg membrane: Formed during passage of the egg in the oviduct ; eg. Egg of toad and egg of bird.

Fertilization Fertilization occurs either external in aquatic animals or internal terrestrial animals . Steps of fertilization: 1. Ovulation. 2. Egg transport. 3. Sperm transport. 4. Penetration of the egg. 5. Fusion between egg & sperm. 6. Prevention of polyspermy. 7. Decondensation of egg and sperm nucleus. 8. Metabolic activation of the egg.