The vascular morphometry of some brain stem parts.

With the view of following the vascular system of the cerebral trunk, there have been simultaneously injected coloured tracers combined with radio-opaque substances and radio-isotopes (32P, 22Ca) by intravital perfusion to 130 animals (dogs, rabbits and rats). The macro- and microscopical vasculature of the human brain stem was studied on 30 specimens of adults and children. The angioarchitecture of the diverse parts and sectors of the brain stem was studied as a whole in tetraline transparentised preparations and on histological section in comparison with the microradiographies and to incorporation of radioisotopes. A particular attention has been given to the irrigation of hypoglossal nuclei, the bulbar oliva, and the pontopeduncular region, all being zones with multiple sources of vascularization. The vascular morphometry has been macro- and microscopically performed, the data being worked out mathematically-statistically by computing some hemodynamical indices in order to estimate the circulation in different zones of the brain stem.