uteroplacental sinus [yōō′tə-rō-plə-sĕn′tl] n. Any of the irregular vascular spaces in the zone of the chorionic attachment to the decidua basalis.

uteroplacental sinus [yōō′tə-rō-plə-sĕn′tl] n. Any of the irregular vascular spaces in the zone of the chorionic attachment to the decidua basalis.