arachnoid villus

arachnoid villus
arachnoid villus n ARACHNOID GRANULATION

* * *

one of the thin-walled projections outwards of the arachnoid membrane into the blood-filled sinuses of the dura, acting as a one-way valve for the flow of cerebrospinal fluid from the subarachnoid space into the bloodstream. Large villi, known as arachnoid granulations (or Pacchionian bodies), are found in the region of the superior sagittal sinus. They may be so distended as to cause pitting of the adjacent bone.

Medical dictionary. 2011.

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  • arachnoid villus — one of the thin walled projections outwards of the arachnoid membrane into the blood filled sinuses of the dura, acting as a one way valve for the flow of cerebrospinal fluid from the subarachnoid space into the bloodstream. Large villi, known as …   The new mediacal dictionary

  • Грануляция Арахноидальная (Arachnoid Villus) — отросток паутинной оболочки, проникающий в просвет синуса твердой мозговой оболочки; действует как односторонний клапан для спинномозговой жидкости, переносимой из субарахноидального пространства в венозную кровь синуса. Большие грануляции,… …   Медицинские термины

  • arachnoid granulation — n any of the small whitish processes that are enlarged villi of the arachnoid membrane of the brain which protrude into the superior sagittal sinus and into depressions in the neighboring bone called also arachnoid villus, pacchionian body …   Medical dictionary

  • villus — 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 …   Medical dictionary

  • villus — n.; pl. villi one of many short finger like processes that project from some membranous surfaces. Numerous intestinal villi line the small intestine. Each contains a network of blood capillaries and a lacteal. Their function is to absorb the… …   The new mediacal dictionary

  • Villus — (Latin: shaggy hair [http://www.tiscali.co.uk/reference/encyclopaedia/hutchinson/m0035419.html] Tiscali UK Reference encyclopedia] , plural villi) can refer to: * Intestinal villus. This is the most common meaning when not more precisely… …   Wikipedia

  • ГРАНУЛЯЦИЯ АРАХНОИДАЛЬНАЯ — (arachnoid villus) отросток паутинной оболочки, проникающий в просвет синуса твердой мозговой оболочки; действует как односторонний клапан для спинномозговой жидкости, переносимой из субарахноидального пространства в венозную кровь синуса.… …   Толковый словарь по медицине

  • pacchionian body — pac·chi·o·ni·an body .pak ē ō nē ən n ARACHNOID GRANULATION Pac·chi·o·ni .päk ē ō nē Antonio (1665 1726) Italian anatomist. Pacchioni wrote several papers on the structure and function of the dura mater. In 1705 he published his major treatise on …   Medical dictionary

  • Pacchionian body — see arachnoid villus [A. Pacchioni (1665–1726), Italian anatomist] …   The new mediacal dictionary

  • Choroid plexus — Brain: Choroid plexus Scheme of roof of fourth ventricle. The arrow is in the foramen of Magendie. 1: inferior medullary velum 2: Choroid plexus 3: Cerebellomedullary cistern of subarachnoid cavity 4: Central canal 5: Corpora quadrigemina …   Wikipedia

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