Table 1.

Morphological characteristics of perforating arteries arising from the upper BA and P1 segment in 26 cadaveric specimen^*

^*Values and parentheses indicate average and range, respectively, ^†Length of the P1 segment means the distance between the BA bifurcation and the junction of the posterior communicating and posterior cerebral arteries, ^‡Distance in BA was measured from the BA bifurcation to the perforators arising from ventral surface and just below BA bifurcation. In P1 segment, distance was measured from the BA bifurcation to the 1st origin of thalamoperforating artery of P1 segment. BA : basilar artery, NA : not applicable