eli5: how are human girls already born with all the eggs they’ll ever have?

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I’ve seen videos showing the scale of a human egg and it’s visible to the naked eye- it’s definitely not as small as i thought it would be. So how are girls born with millions of eggs already? Im thinking that large of an amount would take up a considerable amount of space. And how do girls lose eggs from birth if they dont have their first period til adolescence? Since im assuming eggs are mainly lost through periods, excluding trauma or ovarian disorders.

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Anonymous 0 Comments

In addition to the answers already here, I want to add that when you’re thinking about egg cells as large you may be thinking about egg cells after they leave the ovary. Eggs ‘in storage’ are a bit smaller than eggs getting squeezed down a fallopian tube that can be fertilized. Part of the life cycle of an egg is that before it is released from the ovary it spends a few days maturing in a fluid sac on the outside of the ovary. Part of the process is maturing is just growing. All this to say: the eggs in storage are not quite as big as you might be thinking.

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