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Villus
Villus ( la, "shaggy hair", plural villi) may refer to: * Intestinal villus, refers to any one of the small, finger-shaped outgrowths of the epithelial lining of the wall of the intestine. Clusters of projections are referred as intestinal villi. * Chorionic villi, found on the surface of the outermost membrane (the chorion) of the fetus * Arachnoid villi, located on the arachnoid membrane of the brain See also * Villi (other) Villi may refer to: *Plural of Villus (other) *''Le Villi'', an opera-ballet of 1884 by Giacomo Puccini *Ilkka Villi (born 1975), Finnish actor and writer *Villi Bossi (born 1939), Italian sculptor *Villi Hermann (born 1941), Swiss film d ... * {{disambiguation no:Tarmtott ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Intestinal Villus
Intestinal villi (singular: villus) are small, finger-like projections that extend into the lumen of the small intestine. Each villus is approximately 0.5–1.6 mm in length (in humans), and has many microvilli projecting from the enterocytes of its epithelium which collectively form the striated or brush border. Each of these microvilli are about 1 µm in length, around 1000 times shorter than a single villus. The intestinal villi are much smaller than any of the circular folds in the intestine. Villi increase the internal surface area of the intestinal walls making available a greater surface area for absorption. An increased absorptive area is useful because digested nutrients (including monosaccharide and amino acids) pass into the semipermeable villi through diffusion, which is effective only at short distances. In other words, increased surface area (in contact with the fluid in the lumen) decreases the average distance travelled by nutrient molecules, so effectivenes ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Chorionic Villi
Chorionic villi are villi that sprout from the chorion to provide maximal contact area with maternal blood. They are an essential element in pregnancy from a histomorphologic perspective, and are, by definition, a product of conception. Branches of the umbilical arteries carry embryonic blood to the villi. After circulating through the capillaries of the villi, blood returns to the embryo through the umbilical vein. Thus, villi are part of the border between maternal and fetal blood during pregnancy. Structure Villi can also be classified by their relations: * Floating villi float freely in the intervillous space. They exhibit a bi-layered epithelium consisting of cytotrophoblasts with overlaying syncytium ( syncytiotrophoblast). * Anchoring (stem) villi stabilize mechanical integrity of the placental-maternal interface. Development The chorion undergoes rapid proliferation and forms numerous processes, the chorionic villi, which invade and destroy the uterine decidua and a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Villi (other)
Villi may refer to: *Plural of Villus (other) *''Le Villi'', an opera-ballet of 1884 by Giacomo Puccini *Ilkka Villi (born 1975), Finnish actor and writer *Villi Bossi (born 1939), Italian sculptor *Villi Hermann (born 1941), Swiss film director and screenwriter *Villi Baltins, Soviet sprint canoer *Olga Villi (1922–1989), Italian model and actress * Villi Boskovsky, an Austrian violinist * Villi Tokarev Willi Ivanovich Tokarev (; 11 November 1934 – 4 August 2019) was a Russian-American singer-songwriter. In the 1980s, he became famous throughout the Soviet Union for his songs about life as a Russian ''émigré'' in New York in Brighton Beach. ..., a Russian-American singer-songwriter See also * Vili (other) {{disambiguation, given name, surname ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Arachnoid Villi
Arachnoid granulations (also arachnoid villi, and pacchionian granulations or bodies) are small protrusions of the arachnoid mater (the thin second layer covering the brain) into the outer membrane of the dura mater (the thick outer layer). They protrude into the dural venous sinuses of the brain, and allow cerebrospinal fluid (CSF) to exit the subarachnoid space and enter the blood stream. The largest granulations lie along the superior sagittal sinus, a large venous space running from front to back along the center of the head (on the inside of the skull). They are, however, present along other dural sinuses as well. Function Diffusion across the arachnoid granulations into the superior sagittal sinus returns CSF to the venous circulation. The arachnoid granulations act as one-way valves. Normally the pressure of the CSF is higher than that of the venous system, so CSF flows through the villi and granulations into the blood. If the pressure is reversed for some reason, fluid ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
