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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.

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egg membranes
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

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.