[Individual variability in the subthalamic region of children and adolescents in relation to stereotaxic coordinates].

Macromicroscopic and stereologic examination of 120 specimens of the brain of children and adolescents showed that the subthalamic nucleus, zona incerta and Forel's fields have a simple geometric shape which does not change with age. Their linear dimensions increase a little and the stereotaxis coordinates alter. These changes are described by mathematical models in the form of regression equations. The individual variability of the structures studied in subordinate to the general regularities. The individual variants disclosed are not linked in the given age group with the sex, the side of the brain or the shape of the skull.