Athorough understanding of the microanatomy of the basilar artery and its perforators is important for the surgical treatment of basilar trunk aneuryslns 、 Therefore , 25 cadaver brains were dissected and their anatomies were observed under an operating microscope . The findings are given below. On the average ,20. 5 (± 3. 1) small branches, consisting of l 2 (± 2. 2))median branches and 8, 4 (± 1, 9) circumferential branches , originated from the basilar artery . The median branches were distributed rather evenly , whereas the distribution (and number) of the circumferential branches varied , depending on how the anterior inferior cerebellar artery (AICA) and the superior cerebellar artery (SCA)had devel (} ped , In clinical cases that showed a poorly developed AICA and SCA on angiography , the blood supplying the brain stem was found to depend on the circumferential branches , so that when surgically treating such cases , particular attention should be paid to preserving the circumferential branches . Further , fenestration of the basilar artery was seen in two specimens , and since the number of perforators from the fenestrated portion of the basilar artery was found to be the same in brains without this anomaly , trapping of the fenestrated portion should be preferably avoided so as to preserve the perforators.
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