uteroplacental sinuses

u·ter·o·pla·cen·tal si·nuses

irregular vascular spaces in the zone of the chorionic attachment to the decidua basalis.

u·ter·o·pla·cen·tal si·nus·es

(yū'tĕr-ō-plă-sen'tĕl sī'nŭs-ĕz)
Irregular vascular spaces in the zone of the chorionic attachment to the decidua basalis.