There is an obvious partitioning: the mesometrial side, derived from the Wolffian, has more glands. Accordingly, implantation occurs on the antimesometrial side, while placentation happens on the mesometrial side. It is unknown what the other layers develop from.

The myometrium contains a "side population" of stem cells. They are presumably what allows the myometrium to grow during pregnancy.

Muscular structure

The molecular structure of the smooth muscle of myometrium is very similar

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