Note a single chorionic disc viewed from the fetal side. No dividing membranes.
Umbilical cords insert adjacent to each other.
Umbilical cords are extensively knotted. Robbins Pathologic Basis of Disease. Benirschke K, Kaufmann P. Pathology of the human placenta, 3rd ed. Search Medline at National Library of Medicine Please be patient during transfer. Medline will open in a new window.