Abstract
The ultrastructure of the decidual cells at different stages of gestation is described. The decidual cells are formed from the perivascular cells from the eight day of pregnancy. Their ultrastructure resembles that of fetal liver cells. The maternal vessels in the latter part of gestation are lined by multinucleated cells, the origin of which is unknown. The different possibilities are discussed, and evidence is presented in favor of the theory that they may be decidual in origin. The “zone of separation” at parturition is formed mainly by the degeneration of the multinucleated giant cells of the “intermediate zone,” but the debris of degenerated decidual cells also takes part in its formation.
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