[Patterns in changes in the dimensions of the nucleoli of human cardiac neurons during postnatal ontogenesis].

Morphometric studies of the neuronal nucleoli from the hearts of 157 healthy persons at different age, revealed certain regularities in their size changes, which demonstrate a strict quantitative organization--bilogical "quantumness"--of intranuclear synthesis processes and excretory processes into cytoplasm. Five more stable aliquot, as well as less stable, intermediate nucleolus volumes were demonstrated, their percentage content depending on the degree of differentiation, activity and cardiac neurons aging during postnatal ontogenesis.