Chorionic vii Yolk sac 3 (Maternal portion of placenta) (Fetal portion of placenta) Amniotic fluid in amniotic cavity Matemal endometrial Allantois Umbilical cord Chorion venule Umbilical cord: Amnion 5 Intervillus space Maternal endometrial arteriole 2- Amnion (a) 12th week of devolopment Rect - Umbilical cord chorion chorionic villi decidua basalis • fetal blood vessels • umbilical arteries • umbilical vein Amnion covering fetal surface of Placenta 2 4 Umbilical arteries Umbilical vein 6. (b) Fetal surface of placenta Preparation and photography Mark Nielsen

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