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Year :2013
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Month :
March-April
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Volume :
2
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Issue :
1
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Page :
9 - 12
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A Anatomical Study on Relationship Between Posterior Cerebral Artery and Posterior Communicating Artery
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Correspondence Address :
Roopashree R.,
Dr. Roopashree R
No. 145, DSR elite, sy no 52/2, Mahadevapura main road,
Whitefield-ITPL road, Bangalore-560048.
Phone: 09742490865
Email: roopashree.ramakrshna@gmail.com
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Introduction: Background and Objectives: A anastomotic ring called Circle of Willis, which is formed by the internal carotid and vertebrobasilar systems is one of the greatest anastomosis of human body. It slows down the blood before it reaches the brain and helps in collateral circulation. Anatomic study reveals the variation in the pattern and calibre of vessels which make up the circulus arteriosus. The variations in calibre occurring in the posterior communicating artery and posterior cerebral artery are not uncommon.
Methodoloy: A total of 45 brain specimens were collected, cleaned and dissected. A careful examination of the specimens was done to check for variations arterial components of the Circulus Arteriosus. The calibre of the pre communicating (P1) segment of posterior cerebral artery and the posterior communicating artery (PCoA) were carefully recorded.
Results: The posterior part of the Circle of Willis was more anomalous and the posterior communicating artery was the most anomalous segment. The fetal configuration of PCoA was found in 20% of the cases. An inverse relationship was found in the components of the posterior part of the circle, between PCoA and P1 segment on the ipsilateral side. Anomalies in the formation of Circulus Arteriosus may predispose to stroke. The neurosurgical importance of this study lies during the exploration of the region for different purposes. Knowledge of the vascular variations will increase the success of the procedure.
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