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that make up the amniotic egg that provide for the nutrients and protection needed for the embryo's survival. It is located inside the albumen, which is the white of the egg. It encloses the embryo and the rest of the embryonic system. The chorion is also present in
1721:
363:, meaning smooth). As it takes no share in the formation of the placenta, this is also named the non-placental part of the chorion. As the chorion grows, the chorion laeve comes in contact with the decidua parietalis and these layers fuse.
504:. Together these form a double membrane, which functions to remove carbon dioxide and to replenish oxygen through the porous shell. At the time of hatching, the fetus becomes detached from the chorion as it emerges from the shell.
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undergoes atrophy, so that by the fourth month scarcely a trace of the villi is left. This part of the chorion becomes smooth, and is named the
97:
1103:
975:"Droplet-digital PCR assay to detect Merkel cell polyomavirus sequences in chorionic villi from spontaneous abortion affected females"
496:. During growth and development of the embryo, there is an increased need for oxygen. To compensate for this, the chorion and the
1467:
865:
Contini C, Rotondo JC, Magagnoli F, Maritati M, Seraceni S, Graziano A, Poggi A, Capucci R, Vesce F, Tognon M, Martini F (2018).
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The chorionic villi are at first small and non-vascular, and consist of the trophoblast only, but they increase in size and
347:(ruptured at the margin at the left in the image), which consists of the chorion (outer layer) and amnion (inner layer).
1568:
451:
have been detected in chorionic villi from females affected by spontaneous abortion as well as pregnant women. Another
1087: – Histology Learning System at Boston University — "Female Reproductive System: placenta, chorionic plate"
798:
673:
604:
1399:
867:"Investigation on silent bacterial infections in specimens from pregnant women affected by spontaneous miscarriage"
816:"Investigation on silent bacterial infections in specimens from pregnant women affected by spontaneous miscarriage"
328:, the villi cover the entire chorion, and are almost uniform in size; but, after this, they develop unequally.
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661:
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635:
320:. After circulating through the capillaries of the villi, the blood is returned to the embryo by the
92:
1155:
1026:"Footprints of BK and JC polyomaviruses in specimens from females affected by spontaneous abortion"
918:"Footprints of BK and JC polyomaviruses in specimens from females affected by spontaneous abortion"
501:
448:
80:
567:
561:
Diagram showing later stage of allantoic development with commencing constriction of the yolk-sac.
297:, whereas the mesoderm, carrying branches of the umbilical vessels, grows into them, and they are
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can infect the chorion tissue, thereby impacting pregnancy outcome. In addition, footprints of
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690:"The role of chorionic cytotrophoblasts in the smooth chorion fusion with parietal decidua"
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Knowledge articles incorporating text from the 20th edition of Gray's
Anatomy (1918)
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The trophoblast is made up of an internal layer of cubical or prismatic cells, the
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https://www.sciencedirect.com/topics/agricultural-and-biological-sciences/octopoda
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Tagliapietra A, Rotondo JC, Bononi I, Mazzoni E, Magagnoli F, Maritati M (2019).
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Tagliapietra A, Rotondo JC, Bononi I, Mazzoni E, Magagnoli F, Maritati M (2020).
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Tagliapietra A, Rotondo JC, Bononi I, Mazzoni E, Magagnoli F, Maritati M (2019).
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672:“The Octopoda are characterized by eggs that have only a chorion as an envelope”
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Contini C, Rotondo JC, Magagnoli F, Maritati M, Seraceni S, Graziano A (2019).
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Thus the placenta develops from the chorion frondosum and the decidua basalis.
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406:(identical) twins, when the split takes place on or after the third day after
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739:"Monochorionic diamniotic infants without twin-to-twin transfusion syndrome"
370:, increase greatly in size and complexity, and hence this part is named the
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Chapman, R.F. (1998) "The insects: structure and function", Section
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Amniotic embryo. a=embryo, b=yolk, c=allantois, d=amnion, e=chorion
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also have chorions as part of their eggs. For example, fragile
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Cordero L, Franco A, Joy SD, O'shaughnessy RW (December 2005).
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has been detected in the same tissues, but with lesser extent.
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Recent studies indicate that the chorion may be susceptible to
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The villi at the embryonic pole, which is in contact with the
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of the chorion and amnion, usually due to bacterial infection
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The chorion undergoes rapid proliferation and forms numerous
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The chorion consists of two layers: an outer formed by the
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402:. This occurs in 0.3% of all pregnancies, and in 75% of
149:). It develops from an outer fold on the surface of the
687:
16:
Outermost fetal membrane around the embryo in amniotes
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The part of the chorion that is in contact with the
688:Genbačev, O; Vićovac, L; Larocque, N (July 2015).
225:that surround the embryo and other membranes; the
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789:. Washington, DC: Taylor & Francis. p.
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410:. The remaining 25% of monozygous twins become
781:Shulman, Lee S.; van Vugt, John M. G. (2006).
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324:. Until about the end of the second month of
304:Blood is carried to the villi by the paired
217:. In humans it is formed by extraembryonic
185:eggs have only a chorion as their envelope.
40:Diagram showing the chorion of a chicken egg
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545:Diagram illustrating early formation of
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1468:Protein signalling in heart development
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414:. The condition may affect any type of
193:In humans and other mammals (excluding
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630:This article incorporates text in the
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256:or layer of Langhans, and an external
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245:, and an inner formed by the somatic
607:, any abnormal proliferation of the
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229:emerge from the chorion, invade the
19:For the entertainment company, see
13:
1569:Vascular remodelling in the embryo
549:and differentiation of body-stalk.
52:Human fetus enclosed in the amnion
14:
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1126:Membranes of the fetus and embryo
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605:Gestational trophoblastic disease
487:, the chorion is one of the four
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1400:Primary interventricular foramen
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573:Scheme of placental circulation.
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434:. Recent findings indicate that
209:and mother. The chorion and the
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282:, which invade and destroy the
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706:10.1016/j.placenta.2015.05.002
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1:
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197:), the chorion is one of the
660:. Previewed in Google Books
533:Diagram of the human embryo.
188:
7:
1435:Primary interatrial foramen
638:of the 20th edition of
615:, a highly invasive cancer.
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521:Section through the embryo.
157:(in mammals), known as the
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500:fuse together to form the
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1085:Histology image: 19903loa
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1156:Intermediate trophoblast
502:chorioallantoic membrane
489:extraembryonic membranes
449:Merkel cell polyomavirus
331:
1530:Posterior cardinal vein
1463:Aorticopulmonary septum
743:Journal of Perinatology
420:monochorionic multiples
205:between the developing
1525:Anterior cardinal vein
1415:Atrioventricular canal
658:The egg and embryology
472:
412:dichorionic diamniotic
348:
221:and the two layers of
161:in other animals. In
105:Anatomical terminology
1535:Common cardinal veins
756:10.1038/sj.jp.7211405
470:
432:pathogenic infections
359:(from the Latin word
339:
1405:Endocardial cushions
398:that share the same
308:, which branch into
1371:Primitive ventricle
1334:Development of the
1283:Reichert's membrane
1151:Syncytiotrophoblast
392:Monochorionic twins
387:Monochorionic twins
381:Monochorionic twins
262:syncytiotrophoblast
1679:Vitelline arteries
1643:Inferior vena cava
1410:Septum intermedium
1361:Truncus arteriosus
1336:circulatory system
1184:Intervillous space
600:Chorionic hematoma
473:
353:decidua capsularis
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318:cotyledon arteries
310:chorionic arteries
306:umbilical arteries
213:together form the
201:that exist during
159:vitelline membrane
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1655:Ductus arteriosus
1623:Fetal circulation
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1396:Atrioventricular
1390:Chamber formation
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1278:Heuser's membrane
1042:10.1002/jcp.27490
992:10.1002/jcp.29213
934:10.1002/jcp.27490
884:10.1002/jcp.26952
833:10.1002/jcp.26952
785:Prenatal medicine
508:Additional images
437:Ureaplasma parvum
372:chorion frondosum
125:is the outermost
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98:E5.11.3.1.1.0.3
21:Chorion (company)
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1663:Umbilical artery
1651:Pulmonary artery
1603:Connecting stalk
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1376:Primitive atrium
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590:Chorioamnionitis
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111:edit on Wikidata
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457:BK polyomavirus
445:JC polyomavirus
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418:, resulting in
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368:decidua basalis
345:fetal membranes
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314:chorionic villi
284:uterine decidua
279:chorionic villi
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254:cytotrophoblast
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227:chorionic villi
199:fetal membranes
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979:J Cell Physiol
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871:J Cell Physiol
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1245:Circulatory
1141:Trophoblast
404:monozygotic
243:trophoblast
231:endometrium
223:trophoblast
129:around the
63:Identifiers
1732:Embryology
1716:Categories
1553:Lymph sacs
1507:Aortic sac
1273:Blastocoel
1030:Hum Reprod
922:Hum Reprod
620:References
485:monotremes
426:Infections
195:monotremes
173:is in the
169:while the
1163:Allantois
547:allantois
498:allantois
326:pregnancy
274:processes
203:pregnancy
189:Structure
1670:yolk sac
1613:Placenta
1608:Yolk sac
1489:Arteries
1252:Placenta
1068:53106591
1060:30590693
1011:31549405
960:53106591
952:30590693
903:30078192
852:30078192
765:16281049
724:26003500
694:Placenta
579:See also
477:reptiles
441:bacteria
400:placenta
341:Placenta
247:mesoderm
219:mesoderm
179:mollusks
177:. Some
151:yolk sac
147:amniotes
143:reptiles
1706:Anatomy
1598:Chorion
1481:Vessels
1421:Atrial
1257:Chorion
1168:Decidua
715:4476638
636:page 60
494:insects
183:octopus
163:insects
135:mammals
123:chorion
86:D002823
74:chorion
58:Details
29:Chorion
1692:Portal
1199:cavity
1189:Amnion
1133:Embryo
1091:McGill
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644:(1918)
483:, and
295:ramify
288:embryo
276:, the
268:Growth
237:Layers
211:amnion
131:embryo
1659:Aorta
1647:Heart
1562:Other
1517:Veins
1456:Other
1344:Heart
1266:Other
1211:Fetus
1064:S2CID
956:S2CID
634:from
592:, an
481:birds
453:virus
396:twins
361:levis
332:Parts
207:fetus
175:ovary
139:birds
109:[
69:Latin
1056:PMID
1007:PMID
948:PMID
899:PMID
848:PMID
795:ISBN
761:PMID
720:PMID
447:and
394:are
141:and
121:The
81:MeSH
1194:sac
1046:hdl
1038:doi
997:hdl
987:doi
983:235
938:hdl
930:doi
889:hdl
879:doi
875:234
838:hdl
828:doi
791:447
751:doi
710:PMC
702:doi
475:In
316:as
171:egg
133:in
1718::
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1661:→
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