Morphological study of the formative pattern of the circle of Willis

Mamatha, H and Sushma, RK and Arunashree, * and D’Souza, Antony Sylvan (2012) Morphological study of the formative pattern of the circle of Willis. Elixir Pharmacy, 53. pp. 12099-12102. ISSN 2229-712X

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Brain is a highly vascular organ and receives about 15% of cardiac output. The Circle of Willis (CoW) or Circulus arteriosus is a ring-like arterial structure located at the base of the brain. The circle of Willis has its greatest significance in collateral circulations of the brain specially in old people who may have reduced brain blood supply due to senile arteriosclerosis. Materials and methods: The study was therefore conducted on 20 brains obtained during routine anatomical dissection in the department of Anatomy. The formative pattern of the circle of Willi’s external diameters of internal carotid arteries were measured, length of the anterior communicating was also recorded. Results: Out of twenty specimens studied, 8 specimens showed variations in the formative pattern of circle of Willis. Like The basilar artery continued as Left posterior cerebral artery, Right posterior cerebral artery arising was from right internal carotid artery with Bilateral absence of Posterior communicating artery , right posterior cerebral artery was arising from Right internal carotid artery. Bilateral fetal type of Posterior cerebral arteries. A long anterior communicating artery of about one cm (10mm) was also observed in one of the cases. Though variations of the arteries at the base of the brain are common, it is necessary to be aware of all the variations as they may breed problems in the blood flow to the brain and may cause confusions in radiological procedures.

Item Type: Article
Uncontrolled Keywords: Internal carotid artery;Circle of Willis;Posterior cerebral artery; Posterior communicating artery.
Subjects: Medicine > KMC Manipal > Anatomy
Depositing User: KMC Manipal
Date Deposited: 09 May 2013 04:25
Last Modified: 04 Dec 2013 06:51

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