[Fronto-striate relationships in primate ontogeny]

A comparative investigation on the development of fields in the brain cortical frontal area and in the caudate nucleus was performed in pre- and postnatal life of the monkey and the man. Cyto- and myeloarchitectonics and quantitative methods were applied. Volumes of fields 8, 9, 10, 11, 12, 47, complex of fields 44+45+56 and the caudate nucleus were measured, the size of neuronal bodies was determined. A definite connection in the development of the caudate nucleus and the fields of the frontal area was stated. The development of these formations was found to proceed unevenly: to a definite period, the development of the caudate nucleus dominates (in Macacus ontogenesis--up to a half--one year of life, in human ontogenesis--up to 2-4 years of life). Then the development of the caudate nucleus becomes slower comparing that of the frontal fields.