[Intrathalamic afferent connections of the median center of the thalamus]. / Vnutritalamicheskie afferentnye sviazi sredinnogo tsentra talamusa.

Microiontophoretic local injection of horseradish peroxidase (HP) have been performed into the median center (MC). Many thalamic nuclei are sources of projections into MC, though the role of each nucleus is not equivalent. MC is predominantly connected with nonspecific formations (reticular, parafascicular, central-lateral, paracentral, ventromedial, paraventricular). Among them the reticular nucleus is distinguished, it sends its efferent fibers from the ventral, ventrolateral and lateral areas. In the anterior part of the reticular nucleus there are no HP-labelled cells. In MC little projections from specific nuclei (ventrobasal complex, ventrolateral nucleus, geniculate body) are presented, as well as simple projections from the associative nuclei. The data obtained are in keeping with electron physiological investigations.

[Study of thalamic input in the motor area of the cat cortex by means of retrograde axonal transport of horseradish peroxidase]. / Izuchenie talamicheskikh vkhodov v dvigatel'nuiu zonu kory bol'shikh polusharii mozga koshki s pomoshch'iu retrogradnogo aksonnogo transporta peroksidazy khrena.

HRP-labelled neurons were studied in different thalamic nuclei projected to anterior pericruciate motor cortex of cats. Considerable concentrations of labelled cells were found in the rostral parts of relay nuclei (VL, VPL, VPM). A local type of distribution of such neurons in the associative MD nucleus was discovered as well. The quantity of HRP-labelled units in the intralaminar nonspecific nuclei (Cl, Pc, CM) was small and they were diffusively distributed. Some aspects of heterogenic thalamic afferentation to the motor cortex are discussed.