from The American Heritage® Dictionary of the English Language, 4th Edition
- n. Biology A minute projection arising from a mucous membrane, especially:
- n. Biology One of the numerous vascular projections of the small intestine.
- n. Biology One of the fingerlike projections of the chorion that contribute to the formation of the placenta in mammals.
- n. Botany A fine, hairlike epidermal outgrowth.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. a small projection from a mucous membrane, particularly those found in the intestines
from the GNU version of the Collaborative International Dictionary of English
- n. One of the minute papillary processes on certain vascular membranes; a villosity.
- n. Fine hairs on plants, resembling the pile of velvet.
from The Century Dictionary and Cyclopedia
- n. In anatomy: One of numerous minute vascular projections from the mucous membrane of the intestine, of a conical, cylindric, clubbed, or filiform shape, consisting essentially of a lacteal vessel as a central axis, with an arteriole and a veinlet, inclosed in a layer of epithelium, with the basement membrane and muscular tissue of the mucous membrane, and cellular or reticular tissue.
- n. One of the little vascular tufts or processes of the shaggy chorion of an ovum or embryo, in later stages of development entering into the formation of the fetal part of the placenta. See cut under uterus, Some villiform part or process of various animals. See cut under hydranth.
- n. In botany, one of the long, straight, and soft, hairs which sometimes cover the fruit, flowers, and other parts of plants.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. a minute hairlike projection on mucous membrane
In the northeast, lowland grasslands, locally known as villus, are associated with the floodplains of the river systems.
In the center of the villus is another vessel, with thinner and more transparent walls, which is the commencement of a lacteal.
The mature enterocytes at the tip of the villus are the cells that are most susceptible to IR
Sometimes it's an earlier test called CVS, or chorionic villus sampling, which collects a bit of tissue from the placenta.
The defect, which occurs in one in 700 births, is usually diagnosed during the second trimester with amniocentesis or chorionic villus sampling, which require extraction and testing of fetal genetic material from the placenta.
Prenatal diagnostic procedures: amniocentesis, chorionic villus sampling (CVS), fetal blood sampling and fetal skin/muscle biopsy
Isada NB, Parr DP, Johnson MP, Straus SE, Holzgreve W, Qureshi F, Evans MI: In utero diagnosis of congenital varicella-zoster virus (VZV) infection by chorionic villus sampling (CVS) using polymerase chain reaction (PCR).
Cells are collected either by amniocentesis or chorionic villus sampling, and scientists test the fetal DNA in those cells.
During a pregnancy, the fetus could be tested for the mutation with standard prenatal testing (chorionic villus sampling or amniocentesis).
Prenatal diagnosis -- DNA is isolated from the cells of the developing baby though one of two procedures, chorionic villus sampling (CVS) or amniocentesis, and is analyzed for alterations in the APCgene.