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an extraembryonic fetal membrane, composed of trophoblast lined with mesoderm; it develops villi, becomes vascularized, and forms the fetal part of the placenta.
chorion frondo´sum the placental part of the chorion; it is covered by villi.
chorion lae´ve the nonvillous, membranous part of the chorion.
Miller-Keane Encyclopedia and Dictionary of Medicine, Nursing, and Allied Health, Seventh Edition. © 2003 by Saunders, an imprint of Elsevier, Inc. All rights reserved.
the nonvillous, membranous part of the chorion where the chorionic villi have degenerated.
Synonym(s): chorion laeve
Farlex Partner Medical Dictionary © Farlex 2012
The smooth, nonvillous portion of the chorion.
See also: chorion
Medical Dictionary, © 2009 Farlex and Partners