[Microsurgical anatomy of the ampulla of Galen].

Anatomic study of 20 injected specimens dissected under operating microscope allowed evaluation of anatomic site of Galen's ampulla, venous confluents of Galen's ampulla, and internal cerebral veins' terminations and their arterial connections in this region. Findings demonstrated that even the wall of the great vein of Galen was supplied by arterioles, as though it was vascularized in the same way as durameter.