The paper presents the method elaborated by the authors for production, storage and implantation of embryonal nervous tissue (ENT), Extracerebral implantation was performed in 33 epileptic patients aged 2-58 years. Clinical state of the patients and EEC alterations were studied. Before treatment the patients' mental status was characterized by affective disorders, dysphoria, depression, exhaustion of mental processes, varying intellectual-mnesttc decrease and behavioral disinhtbition. Oligophrenia as of debility was observed in several cases. After implantation the pronounced positive changes in both paroxysmal states and overall mental status were observed in all the cases irrespective of their age of the patients. These clinical changes correlated with the dynamics of EEC changes (EEC changes were not observed in 2 individuals with positive clinical effects).