Mamatha, H and Suhani, Sumalatha and Sushma, RK (2014) An Unusual Variation in the Formation of the Circle of Willis –A Case Report. International Journal of Pharmaceutical, Biological and Chemical Sciences, 3 (2). pp. 55-57. ISSN 2278-5191

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Abstract

The Circle of Willis is a ring-like arterial anastomoses in the brain responsible for the distribution of oxygenated blood throughout the cerebral mass. Functionally, the circle of Willis is rarely complete even though it is the only anastomosis in brain, and also ones these branches enter the brain substance no further anastomoses occur. They behave like end arteries. During routine M.B.B.S dissection in the department of Anatomy, Kasturba Medical College, Manipal ,we came across a variation in the formation of circle of Willis. The basilar artery continued as left posterior cerebral artery. Right posterior cerebral artery was arising from right internal carotid artery. Bilateral absence of posterior communicating artery was also observed. Therefore in order to plan and design surgical and endovascular interventions and yield successful results, probability of combined anatomical variations in the region should be kept in mind by the professionals.

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