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this post was submitted on 17 Apr 2026
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Wait, are you asking where the actual fertilized egg cell is? I think that's what you're wanting, but could be wrong.
The yolk isn't actually the "egg" in the same way a human ovum is. I mean, it kinda is, but there's a spot in/on it called a blastodisc. That is what rooster sperm fertilizes, and where all development starts from. Once fertilized, it's called a blastoderm. Not the blastodisc is the direct equivalent of a mammalian ovum.
That's why the embryo develops in roughly the same place, it's all starting from one place; and because of how yolks form, that growth is going to be roughly towards the center.