The outer syncytial layer of the trophoblast.
Syncytiotrophoblast
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| Syncytiotrophoblast | |
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| Primary chorionic villi. Diagrammatic. | |
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| Secondary chorionic villi. Diagrammatic. | |
| Gray's | subject #6 47 |
| Carnegie stage | 5a |
| Days | 8 |
| MeSH | Syncytiotrophoblasts |
Syncytiotrophoblasts are multinucleated cells found in the placenta of embryos.
They are the outer syncytial layer of the trophoblasts and actively invade the uterine wall.
They form the outermost fetal component of the placenta (also known as 'syntrophoblast') and massively increase the surface area available for nutrient exchange between the mother and the fetus.
Cells from the syncytiotrophoblast secrete progesterone in addition to human chorionic gonadotropin (hCG); the latter prevents degeneration of the corpus luteum. Progesterone serves to maintain the integrity of the uterine lining, and until the syncytiotrophoblast is mature enough to secrete enough progesterone (in the fourth month of embryonic development), it is aided by the corpus luteum graviditatis. [1]
Contents |
Additional images
 Section through embryonic area of Vespertilio murinus to show the formation of the amniotic cavity. |
See also
References
- ^ Langman's Medical Embryology, 10th Edition. T.W. Sadler. p. 34
External links
- Histology at BU 19908loa - "Female Reproductive System: placental villi"
- Nature (Journal) Diagram
- Musicki B, Pepe G, Albrecht E (1997). "Functional differentiation of placental syncytiotrophoblasts during baboon pregnancy: developmental expression of chorionic somatomammotropin messenger ribonucleic acid and protein levels.". J Clin Endocrinol Metab 82 (12): 4105–10. doi:. PMID 9398722. Article
- Diagram at McGill
- Syncytiotrophoblast at eMedicine Dictionary
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 | Cytotrophoblast |
| Bilaminar disc |
| Limb bud |
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 | Veterinary Dictionary. Saunders Comprehensive Veterinary Dictionary 3rd Edition. Copyright © 2007 by D.C. Blood, V.P. Studdert and C.C. Gay, Elsevier. All rights reserved. Read more |
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