[Connections of various fields of the parietal cortex with the caudate nucleus of the cat brain]. / Sviazi razlichnykh polei temennoi kory s khvostatym iadrom mozga koshki.

By means of the light and electron microscopy methods efferent connections of the fields 5a, 5b and 7 with the caudate nucleus have been studied. These fields are predominantly projected to the dorsolateral corner of the middle and posterior head of the caudate nucleus. The fields 5b and 7, unlike the field 5a, give also origin to the fibers, terminating in the central part of the head and in the caudate nucleus body. The electron microscopic investigation proves the monosynaptic nature of the fields 5a, 5b and 7 with the dorsolateral part of the middle and posterior parts of the caudate nucleus head. The parietal cortex gives origin, mainly, to fine myelin fibers (0.665 +/- 0.029), terminating in the part mentioned of the caudate nucleus. These fibers form small terminals (0.310 +/- 0.014 to 0.430 +/- 0.020 mcm) with asymmetrical membranous thickening; these terminals end on the spines (with a poorly expressed spine apparatus) of the dendrites, evidently, of the middle spine cells. Axonal terminals of the parietal cortex form axodendritic terminals extremely seldom. Axospinous synapses on the dendrites of the middle spine cells, situating in the dorsolateral part of the caudate nucleus head are supposed to be a morphological substrate, ensuring the cortical control of the parietal cortex at the level of the caudate nucleus.

[Ultrastructure of the fascicular area of the adrenal cortex after parathyroidectomy in the rat]. / Ul'trastruktura puchkovoi zony kory nadpochechnikov paratireoprivnykh krys.

Electron microscopic investigation of the adrenocortical fascicular zone was conducted to determine serum calcium content in control and parathyroprivic random bred adult rats on the 5th, 15th and 30th days after parathyroidectomy. During the entire experiment calcium content was lowered. There were no marked changes in the ultrastructure of the secretory cells of the fascicular zone on the 5th day. In experimental animals killed on the 15th day after operation adrenocortical ultrastructural changes indicated structural-functional activity as well as destructive processes in the secretory apparatus. On the 30th day after parathyroidectomy destructive processes prevailed in most adrenocorticocytes. Considerable shifts were noted in the system of the hemocirculatory bed of the adrenocortex of parathyroprivic animals.

[Changes in the ultrastructure of synapses and neurons of the ventral horns of the spinal cord in cats with tetany as a result of the removal of the parathyroid glands]. / Izmeneniia ul'trastruktury sinapsov i dvigatel'nykh neironov ventral'nykh rogov spinnogo mozga u koshek s paratireoprivnoi tetaniei.

An electron microscopic investigation on ultrastructure of synapses and ventral horns of the lumbar thickening in the spinal cord of cats with parathyroprival tetany has been performed. When motor disorders are clearly seen on the 2d - 4th days after removal of the parathyroid glands, together with the changes demonstrating functional activity of the synapses, certain irreversible degenerative changes of the "dark" type are seen in the axodendritic and axosomatic synapses. A complex of structural-metabolic changes has been revealed in the motor neurons, they have both functional-compensatory and degenerative character. It is possible to suggest that the changes revealed at parathyroprival tetany result from a disturbed metabolism and increased afferent influences.