[The role of adrenergic structures in the control of cerebral circulation].

A study of the cerebral blood flow carried out by the thermoelectric method demonstrated that stimulation of the cervical sympathetic nerve led to marked changes in the cerebral blood supply. The blood flow changes were two-stage in character: an initial slight increase changed to a decrease below the initial level. Pharmacological analysis with the use of alpha- and beta-adrenoblockers showed a constrictor reaction of the cerebral vessels to be caused by excitation of the alpha-adrenoreactive structures, and the dilatator reaction - by the beta-adrenoreactive structures. An opinion is put forward on a possible mechanism of these changes.