LE POLYGONE DE WILLIS PDF

Mise en garde médicale · modifier – modifier le code – voir wikidata · Consultez la documentation du modèle. La maladie de moyamoya (appelée aussi moyamoya, maladie de Nishimoto, maladie de Nishimoto-Takeuchi-Kudo ou maladie obstructive du polygone de Willis). Le cercle cérébral artériel (circulus artériel cérébral), également connu sous le cercle de Willis (GC), boucle de Willisor Willis polygone) a été décrite par. Download scientific diagram | 2-Polygone de Willis. (1) Artère communicante antérieure. (2) Artère carotide interne. (3) Artère cérébrale postérieure. (4) Artère .

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The circle of Willis also called Willis’ circleloop of Williscerebral arterial circleand Willis polygon is a circulatory anastomosis that supplies blood to the brain and surrounding structures. It is named after Thomas Willis —an English physician. The circle of Willis is a part of the cerebral circulation and is composed of the following arteries: The middle cerebral willkssupplying the brain, are not considered part of the circle.

The left and right internal carotid arteries arise from the left and right common carotid arteries. The posterior communicating artery is given off as a branch of the internal carotid artery just before it divides into its terminal branches – the anterior and middle cerebral arteries. The anterior cerebral artery forms polyogne anterolateral portion of the circle of Willis, while the middle cerebral artery does not contribute to the circle.

The right po,ygone left posterior cerebral arteries arise sillis the basilar arterywhich is formed by the left and right vertebral arteries. The vertebral arteries arise from the subclavian arteries. The anterior communicating artery connects the two anterior cerebral arteries and could be said to arise from either the left or right side. All arteries involved give off cortical and central branches.

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Polygone de Willis

The central branches supply the interior of the circle of Willis, more specifically, the Interpeduncular fossa. The cortical branches are named for the area they supply.

Since they do not directly affect the circle of Willis, they are not dealt with here. Considerable anatomic variation exists in the circle of Willis. Based on a study of brains, the classic anatomy of the circle is only seen in In another variation the anterior communicating artery is a large vessel, such that a single internal carotid supplies both anterior cerebral arteries; this is known as an azygos anterior cerebral artery.

The arrangement of the brain’s arteries into the circle of Willis creates redundancy analogous to engineered redundancy for collateral circulation in the cerebral circulation. If one part of the circle becomes blocked or narrowed stenosed or one of the arteries supplying the circle is blocked or narrowed, blood flow from the other blood vessels can often preserve the cerebral perfusion well enough to avoid the symptoms of ischemia.

File:Polygone de Willis.png

The redundancies that the circle of Willis dee can also lead to reduced cerebral perfusion. Subclavian steal syndrome results from a proximal stenosis narrowing of the subclavian arteryan artery supplied by the aortawhich is also the same blood vessel that eventually feeds the circle of Willis via the vertebral artery.

From Wikipedia, the free encyclopedia. Circle of Willis Schematic representation of the circle of Willisarteries of the brain and brain polyone.

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Blood flows up to the brain through the vertebral arteries and through the internal carotid arteries. The arteries of the base of the brain. Basilar artery labeled below center.

The temporal pole of the cerebrum and the cerebellar hemisphere have been removed on the right side. Inferior aspect viewed from below. Thomas Willis’ Famous Eponym: Turkish Journal of Medical Sciences.

Retrieved 16 July Augustine; David Fitzpatrick; William C. Archived from the original on Accessed on November 6, Correlation with cerebral collaterals in internal carotid artery occlusive disease”. A Journal of Cerebral Circulation. This article polygohe anatomical terminology; for an overview, see anatomical terminology. Arteries of the head and neck. Circle of Willis ACA anterior communicatingRecurrent artery of HeubnerOrbitofrontal polygnoe MCA anterolateral centralPrefrontal arterySuperior terminal branchInferior terminal branchAnterior temporal branch posterior communicating anterior choroidal.

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Schematic representation of the circle of Willisarteries of the brain and brain stem. Anatomical terminology [ edit on Wikidata ]. Wikimedia Commons has media related to Circle of Willis.