TYPES OF THE POSTERIOR PART OF THE CEREBRAL ARTERIAL CIRCLE AND ASSOCIATED ARTERIAL VARIATIONS IN HUMAN ADULT CADAVERS

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Background. There is a high incidence of variations of the posterior part of the cerebral arterial circle (CAC), but there is an insufficient data about types of the posterior part of the CAC in adult period or its association with specific arterial variations. Aim. This morphological study had as the aim to add new facts about angioarchitecture of the CAC. Material and Methods. Classification of the posterior part of the CAC into types and subtypes, by already formed types from literature, was performed on 388 human adult brains during the forensic autopsies. Results and Discussion. Incidences of transitory type was 4.9%; fetal - 14.94%; adult - 79.97% without statistical significance by side. Incidence of symmetric types was 75.27% (with predominance of the bilateral adult type). Incidence of asymmetric types were: adult-transitory - 6.18%, fetal-transitory - 1.35% and adult-fetal - 17.2%. The most of the arterial variations were left sided and excess artery (a. communicans intermedia*) in the posterior part of the CAC was associated with the fetal type of the CAC. Conclusions. Investigation proved domination of symmetrical types of the posterior part of the CAC configuration, independent of age, gender or cause of death.