Chickscope Embryology:

Day 1: The Journey Begins

Before the Egg is Laid:

• The egg is fertilized.

• The zygote divides and begins to grow.

• The cells segregate into groups of specialized function.

• The embryo nearly stops growing between laying and incubation.

During Incubation:

• The area pellucida and area opaca of the blastoderm develop.

Major events:

• 18 hours: The alimentary tract appears.

• 19 hours: The brain crease begins to form.

• 20 hours: Somites appear.

• 21 hours: The brain and nervous system begin to form.

• 22 hours: The head fold begins to form.

• 23 hours: Blood islands appear.

• 24 hours: The eyes begin to form.

What Do I Look Like Today?

Focus On: The Anatomy of an Egg

• What is the yolk and what is it made of?

• Meiosis and mitosis.

• A covering of albumen.

• Adding the shell.

• Incubation of the egg.

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