Anatomy of the Placenta Bohua pane Urtica arts tOrpor blood) At birth 500 g 15-25 cm Diameter 3 cm thick Anchoringⅷii(固 定绒毛) Placental septa 15-20 Cotelydons 胎盘小叶)Anatomy of the Placenta • At birth 500 g • 15-25 cm Diameter • 3 cm thick • Anchoring villi（固 定绒毛） • Placental septa → 15-20 Cotelydons（ 胎盘小叶）