Every sperm cell starts out as a spermatogonium. These stem cells sit along the wall of tiny tubes in the testes.
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The testes are two body parts in males. Inside them are lots of tiny, coiled tubes.
Spermatogonia sit in a row along the outer wall of those tubes. They are roundish cells with a big nucleus.
They are stem cells, cells that can split again and again to make new cells.
Spermatogonia can keep making new cells for most of a person's life!
When someone grows up, spermatogonia start dividing. Each time one splits:
Sperm cells carry half of the instructions (DNA) needed to make a baby.
Press Make a new cell on the 3D model.