[Functional anatomy of the third ventricle. Neuropsychological data].

The functional structures surrounding the third ventricle explain the occurrence of neuropsychological disorders when a tumor develops in this area. The functional environment of the third ventricle is involved in memory, motor executive control, endocrine and vegetative regulations. The types of memory deficit, the behavioural and emotional regulations, the interhemispheric transfer, and the regulation of executive functions are analyzed and correlated to the concerned anatomical structures. The review of the literature collected few specific considerations in neuropsychological dysfunctions occurring with tumors of the third ventricle. A retrospective study was conducted in 17 patients of the national series operated on for a third ventricle lesion : long-term memory and executive functions were frequently impaired in the patients, and the deficits were underestimated by usual follow-up. More systematic utilization of preoperative and postoperative test batteries is necessary for a better evaluation of neuropsychological disorders after third ventricle surgery.