Chorionic vessels

Chorionic (plate) vessels are blood vessels, including both arteries and veins, that carry blood through the chorion in the feto-placental circulation. Chorionic arteries branch off the umbilical artery, and supply the capillaries of the chorionic villi. Increased vasocontractility of chorionic arteries may contribute to preeclampsia. ...
Found on http://en.wikipedia.org/wiki/Chorionic_vessels

Chorionic Vessels

Branches of the umbilical blood vessels that fan out throughout the connective tissue layer of the of the chorionic vessels, which are the tissues on the fetal side of the placenta. Synonym(s): Placental Surface Vessels
Found on http://www.pregnology.com/AZ/C/5
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