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Home > E. Pathology by systems > Reproductive system > Fetus and annexes > Placenta > decidua


Tuesday 30 October 2018


Definition : The decidua is the uterine lining (endometrium) during a pregnancy, which forms the maternal part of the placenta. It is formed under the influence of progesterone and forms highly characteristic cells decidual cells.

The part of the decidua that interacts with the trophoblast is the decidua basalis (also called decidua placentalis), while the decidua capsularis grows over the embryo on the lumenal side, enclosing it into the endometrium.

The remainder of the decidua is termed the decidua parietalis or decidua vera, and it will fuse with the decidua capsularis by the fourth month of gestation.

See also

- decidualization
- decidualized cells