different between monochorionic vs chorion

English

Etymology

mono- +? chorionic

Adjective

monochorionic

1. Sharing one foetal membrane, or chorion. Typically used of identical twins.

See also

• dichorionic

English

Etymology

From Late Latin chorion, from Ancient Greek ?????? (khórion, “membrane surrounding the fetus, afterbirth”).

Pronunciation

• IPA^(key): /?k??i?n/

Noun

chorion (plural chorions or choria)

1. (anatomy, biology) The protective and nutritive membrane in higher vertebrates that attaches the fetus to the uterus.
   • 2002, Rovert E. A. Stewart, Barbara E. Stewart, Female Reproductive Systems, entry in Encyclopedia of Marine Mammals, page 425,

     The allantois fuses with the chorion, forming a small round area, the allentochorion. This region becomes the placenta (Fig. 3).

   • 2006, Ona Marie Faye-Petersen, Debra S. Heller, Vijay V. Joshi, Handbook Of Placental Pathology, page 4,

     In this illustration, some license is taken, since the amnion is shown as still separate from the chorion; this is done to illustrate the process of apposition of the amniotic sac to the chorion and to accentuate the interposition of the yolk sac between the amnion and the chorion.
2. (biology, entomology) The outer case of an insect egg.
   • 2008, John L. Capinera, Eggs of Insects, entry in John L. Capinera (editor), Encyclopedia of Entomology, page 1290,

     In addition to facilitating gas exchange and water conservation, the chorion must, in some cases, allow uptake of water or liquid nutrients from the environment.

3. (botany) The outer membrane of seeds of plants.

Derived terms

Translations

French

Pronunciation

Noun

chorion m (plural chorions)

1. (anatomy) chorion (all senses)

Derived terms

• chorionique