MORPHOLOGICAL DEVELOPMENT OF FOREBRAIN IN HOODED CROW, CORVUS CORNIX,NESTLINGS

Postnatal ontogenesis of brain in nestlings of hooded crow (Corvus cor nix) was studied in eight age-periods corresponding to definite change s in the central nervous system. Particular attention has been given t o late stages of ontogenesis and to the oneset of forming elementary r easoning. During postnatal ontogenesis of tile forebrain in striatum a reas the neuron amount increases twenty two times, that of glia 26 tim es. Neuro-glial complexes of cells with different number of elements a re the most important structural and functional units in the forebrain of crows since formation and maturation of these complexes is tightly related to the time of developing the complicated forms of behaviour in postnatal ontogenesis.