Primary oocytes are early egg cells. They are made before birth and then rest quietly in the ovaries, sometimes for many years.
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Primary oocytes live in the ovaries. Each one is wrapped in a thin layer of flat helper cells. Together they make a tiny bubble called a follicle.
An oocyte is round, with a large nucleus. When it grows, it becomes one of the biggest cells in the human body.
A fully grown egg cell is about as wide as a strand of hair. That is huge for a cell!
Primary oocytes are made before birth. Then they pause and rest.
An egg cell carries half of the instructions (DNA) needed to make a baby.
Press Wake up on the 3D model and watch the oocyte start to grow.