Velamentous cord insertion

In velamentous cord insertion, the umbilical cord inserts in the chorion rather than in the mass of the placenta. The exposed vessels are not protected by Wharton’s jelly and hence are vulnerable to rupture.

• http://www.emedicine.com/med/topic3276.htm
• http://www.nature.com/jp/journal/v27/n7/fig_tab/7211757f1.html

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