[Cortico-cortical connections in the motor cortex of the brain; a study using the peroxidase method]. / Korkovo-korkovye sviazi dvigatel'noi kory mozga, issledovanie s pomoshch'iu peroksidaznogo metoda.

Using a method based on retrograde axonal transport of horse-radish peroxidase (HRP), the cortico-cortical afferents of the motor cortex were studied. After enzyme injection into the posterior sigmoideus gyrus, the HRP product was found in the first and the second somatic sensory areas and in parietal cortex (fields 5a, 5b). The HRP-positive neurons occurred in layers II, III and V of the cortex and belonged to the pyramidal cells.

[Structural characteristics of the axons of nerve cells of the cat motor cortex]. / Strukturnaia kharakteristiki aksonov nervnykh kletok dvigatel'noi kory mozga koshki

The axons of both pyramid and stellate neurons have a great number of ramifying collaterals which are considered in a comparative aspect. The both types of nerve cells are characterized by almost similar systems of the branching of axons, types of collaterals and end structures. The neurons are distinguished due to progressive development of one features of the axon structure and to a certain reduction of the others. In extreme forms the stellate cells have a well developed pericellular network, not coming outside the limits of the branching of their dendrites, while the pyramid cells are characterized by the mighty development of the main trunk and the absence of recurrent collaterals. Between these forms there are transitional forms.

[Experience with the use of horseradish peroxidase for light and electron microscope studies of interneuronal connections]. / Opyt ispol'zovaniia peroksidazy khrena klia izucheniia mezhneironnykh sviazei v svetovoi i élektronnoi mikroskopii

By the method based on a retrograde axonal transport of exogenous horseradish peroxidase (HRP), the origins of afferentation of the motor cortex of adult cats, kittens and albino rats were studied. HRP-positive neurons were found by light and electron microscopy in the somatosensory cortex (C1) of the ipsilateral hemisphere and in the portions of the cortex of the contralateral hemisphere which were symmetrical to the site of injection of HRP. The disposition of neurons, marked by HRP, in the Vth layer of the motor cortex suggest that these neurons may send their axons into the bundles of comissural fibres going to the motor cortex of the opposite hemisphere. This method considerably expands possibilities of revealing the origins of afferentation of the investigated portion of the nervous system and allows more complete and reliable investigation of interneuronal connections.