What Is the Difference Between Oogonia and Primary Follicle?

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Oogonia Primary follicle
These mark the first and foremost stage of follicular development. These are the second stage of the follicular development.
Oogonia are formed within each foetal ovary during embryonic development. Primary follicles are formed after birth when primary oocyte gets surrounded by a layer of granulosa cells.
Oogonia are millions in number inside the foetal ovary. Primary follicles are around 60,000 to 80,000 in each ovary at the puberty.

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Oogonia	Primary follicle
These mark the first and foremost stage of follicular development.	These are the second stage of the follicular development.
Oogonia are formed within each foetal ovary during embryonic development.	Primary follicles are formed after birth when primary oocyte gets surrounded by a layer of granulosa cells.
Oogonia are millions in number inside the foetal ovary.	Primary follicles are around 60,000 to 80,000 in each ovary at the puberty.