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Fertilization Begins

From The Biology of Prenatal Development.Buy Now

Note:

Fertilization begins when a single spermatozoon penetrates the zona pellucida, which surrounds the oocyte. This event triggers a reaction called the zona reaction, which dramatically alters the outer membrane and prevents the entry of any additional spermatozoa into the oocyte.

Label Key:

  • 1. principal piece of spermatozoon
  • 2. zona pellucida
  • 3. midpiece
  • 4. neck
  • 5. postacromial region
  • 6. acrosomal cap

All ages referenced to fertilization, not last menstrual period.
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Fertilization Begins
Fertilization Begins
Chromosomes
Chromosomes
DNA Structure
DNA Structure
A Human Cell
A Human Cell
Chromosomes and the Nucleus
Chromosomes and the Nucleus
Sperm
Sperm
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