villus


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villus

 [vil´us] (L.)
a small vascular process or protrusion, as from the free surface of a membrane.
arachnoid villi microscopic projections of the arachnoid into some of the venous sinuses.
chorionic villi see chorionic villi.
intestinal villi multitudinous threadlike projections covering the surface of the mucous membrane lining the small intestine, serving as the sites of absorption of fluids and nutrients.
synovial villi slender projections from the surface of the synovial membrane into the cavity of a joint; called also haversian glands.

vil·lus

, pl.

vil·li

(vil'ŭs, vil'ī), Do not confuse this word with the adjective villous.
1. A projection from the surface, especially of a mucous membrane. If the projection is minute, as from a cell surface, it is termed a microvillus.
2. An elongated dermal papilla projecting into an intraepidermal vesicle or cleft.
[L. shaggy hair (of beasts)]

villus

(vĭl′əs)
n. pl. villi (vĭl′ī)
1. Biology A minute projection arising from a mucous membrane, especially:
a. One of the numerous vascular projections of the small intestine.
b. One of the fingerlike projections of the chorion that contribute to the formation of the placenta in mammals.
2. Botany A fine, hairlike epidermal outgrowth.

vil·lus

, pl. villi (vil'ŭs, -ī)
1. A projection from the surface, especially of a mucous membrane. If the projection is minute, as from a cell surface, it is termed a microvillus.
2. An elongated dermal papilla projecting into an intraepidermal vesicle or cleft.
See also: festooning
[L. shaggy hair (of beasts)]

villus

(vil'us) plural.villi [L., tuft of hair]
A small fold or projection of some mucous membranes.

arachnoid villus.

Arachnoid granulation.

chorionic villus.

One of the tiny vascular projections of the chorionic surface that become vascular and help to form the placenta.
See: embryo for illus.; chorion
Enlarge picture
VILLI OF SMALL INTESTINE

intestinal villus.

One of the multiple, minute projections of the intestinal mucosa into the lumen of the small intestine. These projections increase the surface area for absorption of water and nutrients; each contains a capillary network and a lacteal.
See: illustration

synovial villus.

One of the thin projections of the synovial membrane into the joint cavity.

villus

(pl. villi) a finger-like outgrowth, as in the lining of the SMALL INTESTINE. Villi effectively increase the surface area of the gut wall and contain
  1. (a) blood vessels for absorption of carbohydrates and amino acids which pass into the hepatic portal SYSTEM
  2. (b) lacteals which absorb fats into the LYMPHATIC SYSTEM.

vil·lus

, pl. villi (vil'ŭs, -ī) Do not confuse this word with the adjective villous.
1. Projection surface, especially from a mucous membrane.
2. An elongated dermal papilla projecting into an intraepidermal vesicle or cleft.
References in periodicals archive ?
Similarly, control group could not increase the villus size of height, width and crypt depth for duodenum, jejunum, and ilium parts.
Furthermore, there is a critical need to structurally and functionally gain precise definitions of a villus and to use molecular techniques to specify precisely where villi begin and crypts terminate.
The changes in villus height, crypt depth, villus : crypt ratio, and villus area in the ileum at 24, 96, and 168 hpi were similar (Figure 4).
Maintenance of villus height and crypt depth, and enhancement of disaccharide digestion and monosaccharide absorption, in piglets fed on cows' whole milk after weaning.
The villus density among species fulfilled the assumption of homogeneity of variance, and this parameter was analyzed using one-way ANOVA.
Perhaps an increased villus height is paralleled by an increased expression of brush border enzymes and improved nutrient transport system (Hanczakowska and Swiatkiewicz, 2012).
The 5-FU challenge (450 mg/kg) caused a significant reduction in villus height (P<0.001) in both [APOE.sup.+/+] and [APOE.sup.-/-] animals compared with their respective PBS controls.
August 8 by aspiration cytologic type "Chiba" for amniocentesis and chorionic villus sampling, are asked to send technical details, IFU if available and / or any other documentation showing the indication of use of the needle.It should be noted that the draft documents relating to the technical requirements are available on the website: http://www.regione.veneto.it/web/sanita/comunicazioni-and-events
However, a slight increase in the area of the villus enterocytes by 12.96% (P [less than or equal to] 0.05) and crypts--by 13.52% (P [less than or equal to] 0.05) has been revealed (Fig.