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A Golgi study of the development of the inferior olivary nuclear complex in the chicken

The present study is an examination of the qualitative and quantitative changes in the morphology of neurons in the inferior olivary nuclear complex (IOC) of the chicken. The development of the chicken IOC was studied with the Golgi technique between embryonic day 11 (E11) and posthatch day 35 (P35). The olivary cells change most between E11 and E19 and are essentially mature (i.e., similar to P35) at E19. These changes chiefly involve a gradual loss of features that typify immature growing cells (e.g., growth cones, growth buds, filopodia, beaded dendrites); from E11 to P35 there is an increase in the soma size by 42%, an increase in the dendritic field size by 49%, and a decrease in the number of dendritic branches by 47%. A minor but significant fall in the number of dendrites per neuron between E11 and E19 was observed, but as there is no significant difference between E11 and P35, the relevance of this observed change, if any, is unclear.