[Histogenesis of the thymus gland normally and under a change in the level of sympathetic mediation].

Under study was the dynamics of the ultrastructure of the reticular epithelium and lymphocytes of the thymus in postnatal ontogenesis of Balb/c mice. Special attention was given to secretory granules, vacuoles, folliculoid structures, intercellular contacts and cytoplasmic communications (bridges). In parallel the developmental dynamics of the capillary ultrastructure and the state of the adrenergic innervation apparatus were studied. The morphological data are compared with the functional dynamics of the thymus. The postnatal dynamics of means of the transmission of immunological information in the thymus was found. No adrenergic innervation was shown to be present in the thymus of newborns. The role of this mediation as a factor of thymus morphogenesis was confirmed.