| Chorionic villi | | | | Diagram of a transverse section, showing the mode of formation of the amnion in the chick. The amniotic folds have nearly united in the middle line. Ectoderm, blue; mesoderm, red; entoderm and notochord, black. (Villi of chorion labeled at upper left.) | | | | Model of human embryo 1.3 mm. long. (Villi of chorion labeled at lower right.) | | MeSH | A10.615.284.473.200 | Chorionic villi are villi that sprout from the chorion, in order to give a maximum area of contact with the maternal blood. Image File history File links Gray29. ...
For the alien race in Stephen Donaldsons The Gap Cycle, see Amnion (Gap Cycle). ...
A baby chicken Look up chick in Wiktionary, the free dictionary. ...
The ectoderm is outermost of the three germ layers of the developing embryo, the other two being the mesoderm and the endoderm. ...
The mesoderm is one of the three germ layers in the early developing embryo, the other two layers being the ectoderm and the endoderm. ...
The endoderm, sometimes refered to as entoderm, is one of the three germ layers of the developing embryo, the other two being the ectoderm and the mesoderm. ...
The notochord is a flexible, rod-shaped body found in embryos of all chordates. ...
Image File history File links Gray31. ...
It has been suggested that embryology be merged into this article or section. ...
Medical Subject Headings (MeSH) is a huge controlled vocabulary (or metadata system) for the purpose of indexing journal articles and books in the life sciences. ...
Villi (singular: villus) are tiny, finger-like structures that protrude from the wall of the intestine to help absorb nutrients in the lumen. ...
For the entertainment company see Chorion (company) The chorion surrounds the embryo and other membranes. ...
Embryonic blood is carried to the villi by the branches of the umbilical arteries, and after circulating through the capillaries of the villi, is returned to the embryo by the umbilical veins. The umbilical artery is a paired artery (with one for each half of the body) that is found in the abdominal and pelvic regions. ...
The umbilical vein is a blood vessel present during fetal development that carries oxygenated blood from the placenta to the growing fetus. ...
Thus, the villi are part of the border between maternal and fetal blood during pregnancy.
Development
The chorion undergoes rapid proliferation and forms numerous processes, the chorionic villi, which invade and destroy the uterine decidua and at the same time absorb from it nutritive materials for the growth of the embryo. For the entertainment company see Chorion (company) The chorion surrounds the embryo and other membranes. ...
They undergo several stages, depending on their composition.
Primary chorionic villi The chorionic villi are at first small and non-vascular, and consist of trophoblast only. They are now called primary. [1] The trophoblast (from Greek threphein: to feed) is considered to be the first of all embryonic annexes. ...
Secondary chorionic villi The villi increase in size and ramify, while the mesoderm grows into them. Chorionic villi containing both trophoblast and mesoderm is called secondary chorionic villi. [1] The mesoderm is one of the three germ layers in the early developing embryo, the other two layers being the ectoderm and the endoderm. ...
Tertiary chorionic villi Branches of the umbilical vessels, grows into the mesoderm, and in this way the chorionic villi are vascularized. Chorionic villi containing trophoblast, mesoderm as well as blood vessels are called tertiary chorionic villi.[1] Umbilical vessels can refer to: Umbilical artery Umbilical vein Category: ...
Until about the end of the second month of pregnancy the villi cover the entire chorion, and are almost uniform in size, but after this they develop unequally. A pregnant woman near the end of her term Pregnancy is the carrying of one or more embryos or fetuses by female mammals, including humans, inside their bodies. ...
Floating Villi These villi are found floating freely in the intervillous space. They exhibit a bi-layered epithelium consisting of cytotrophoblasts with overlaying syncytium (syncytiotrophoblast). The introduction to this article provides insufficient context for those unfamiliar with the subject matter. ...
In biology, a syncytium is a large region of cytoplasm that contains many nuclei. ...
Syncytiotrophoblasts are cells found in the placenta of human embryos. ...
Anchoring Villi These villi act to stablise mechanical integrity of the placental-maternal interface. Anchoring villi lack a continuous syncytium, and instead they are featured as villous tips with multilayered columns of large mononuclear cytotrophoblasts.
Tissue composition and cell types The bulk of the villi consist of connective tissues in which blood vessels are found. Most of the cells in the connective tissue core of the villi are fibroblasts. Macrophages known as Hofbauer cells are also present. This article or section is in need of attention from an expert on the subject. ...
Additional images Section through the embryo. Image File history File links Gray21. ...
| Human embryo of about fourteen days, with yolk-sac. Image File history File links Gray459. ...
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See also Chorionic villus sampling (CVS) is a form of prenatal diagnosis to determine genetic abnormalities in the fetus. ...
References - ^ a b c Larsen, William J. : Human embryology. Sherman, Lawrence S.; Potter, S. Steven; Scott, William J. 3. ed.
This article was originally based on an entry from a public domain edition of Gray's Anatomy. As such, some of the information contained herein may be outdated. Please edit the article if this is the case, and feel free to remove this notice when it is no longer relevant. The public domain comprises the body of all creative works and other knowledge—writing, artwork, music, science, inventions, and others—in which no person or organization has any proprietary interest. ...
An illustration from the 1918 edition Henry Grays Anatomy of the Human Body (or Grays Anatomy as it has more commonly become known) is an anatomy textbook widely regarded as a classic work on human anatomy. ...
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