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Oogonia


oogonia: primitive egg cells that accumulate in the ovaries before a female is born.
optic nerve: the nerve that carries impulses from the eye to the brain.
order: a grouping of similar families.
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In females, meiosis occurs in precursor cells known as oogonia that divide twice into oocytes. These stem cells stop at the diplotene stage of meiosis I and lay dormant within a protective shell of somatic cells called the follicle.
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Diploid stem cells called oogonia divide by mitosis to produce more oogonia and primary oocytes. By the time the fetus is 20 weeks old, the process reaches its peak and all the oocytes that she will ever possess (~4 million of them) have been formed.
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