Anatomical Variations of the Circulus Arteriosus in Cadaveric Human Brains

Figure 1

Twenty one different types of circulus arteriosus found in the present study. (a) Classical type of CW (1). (b) Six types associated with the variations of ACoA (6). (c) Three types associated with the variations of A1 (3). (d) Four types associated with the variations of PCoA (4). (e) Types associated with the variations of P1 (5). (f) Other types of CW were seen in (2).