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Year : 2021  |  Volume : 70  |  Issue : 4  |  Page : 221-225

Study of Variations of Posterior Communicating Artery and Types of Posterior Circulation in Human Cadaveric Brains of South Indian Population

1 Assistant Professor, Institute of Anatomy, Madras Medical College, Chennai, Tamil Nadu, India
2 Associate Professor, Department of Anatomy, Government Medical College, Thiruvallur, Tamil Nadu, India

Correspondence Address:
Dr. S Keerthi
Institute of Anatomy, Madras Medical College, Chennai - 600 003, Tamil Nadu
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Source of Support: None, Conflict of Interest: None

DOI: 10.4103/jasi.jasi_215_20

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Introduction: Posterior communicating artery (PComA) is the communicating channel between the internal carotid and vertebrobasilar arterial systems. The hemodynamics of the circle of Willis is influenced by variations in the PComA. Such variations may predispose to ischemic stroke due to inadequate collateral supply. Knowledge regarding the variations of the PComA and posterior circulation is of much clinical importance. Material and Methods: Eighty-eight posterior communicating arteries in 44 human cadaveric brains were studied. The morphological variations and morphometry of PComA and the various types of posterior circulation were noted and analyzed. Results: Morphological variations in PComA consisted of hypoplasia (17.04%) and aplasia (7.95%). The mean length of PComA was 12.72 ± 3.10 mm on the right side and 13.11 ± 3.37 mm on the left side. The four types of posterior circulation were adult type (78.41%), persistent fetal type-partial (12.5%), transitional type (5.68%), and persistent fetal type full (3.41%). Discussion and Conclusion: This study provides a comprehensive description of variations of PComA and types of posterior circulation. Awareness of these anatomical variations will be useful to anatomists, neurophysicians, neurosurgeons, and radiologists.

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