Uterine Early Implantation Site

Uterine Early Implantation Site •Close up of a portion of a spiral artery undergoing transformation to a uteroplacental (decidual) artery. •Wall of the vessel is now made up of intermediate trophoblastic cells with large, slightly irregular nuclei (green arrow). •No endothelial lining or muscular wall. •Small cells surrounding the vessel are decidual cells (endometrial stromal cells) (black arrows) with scattered lymphocytes. (Description By:Melinda Sanders,M.D. ) (Image Contrib. by:Melinda Sanders,M.D. UCHC )