AN OBSERVATIONAL STUDY IN THE HUMAN CADAVERIC BRAINS REGARDING ANATOMICAL VARIATIONS IN THE CIRCLE OF WILLIS IN SOUTH INDIAN POPULATION

DR.A.THIRUVALLUVAN; DR.AZEEM

Volume : VII, Issue : IV, April - 2018

AN OBSERVATIONAL STUDY IN THE HUMAN CADAVERIC BRAINS REGARDING ANATOMICAL VARIATIONS IN THE CIRCLE OF WILLIS IN SOUTH INDIAN POPULATION

Dr. A. Thiruvalluvan, Dr. Azeem

Abstract :

Background: The circle of Willis encircles the stalk of the pituitary gland and provides important communications between the blood supply of the foreain and hindain (ie, between the internal carotid and verteo–basilar systems following obliteration of primitive emyonic connections). Although a complete circle of Willis is present in some individuals, it is rarely seen radiographically in its entirety; anatomical variations are very common and a well–developed communication between each of its parts is identified in less than half of the population.In the present study, anatomical variations in the circle of Willis were noted in the cadaveric ain.

Methods: 189 apparently normal formalin fixed cadaveric ain specimens were collected from forensic department of Madras medical college, Chennai.

Results: 102 Normal anatomical pattern and 87 anatomical variations of circle of Willis were studied. The most common variation observed is in the anterior communicating artery (Broad communicating) followed by other variations in the postesrior cereal arteries, Anterior cereal artery and middle cereal artery was found.

Conclusions: ThoroughKnowledge on of variations in the formation of Circle of Willis have a great impact on the successful outcome of Neuro interventions. Hence all neurosurgical interventions should be preceded by angiography.