[Neuron mechanisms of the regulation of bulbar vagosolitary activity by structures of basolateral amygdala nuclei in cats]. / Neironnaia organizatsiia mekhanizmov reguliatsii aktivnosti bul'barnykh vagosolitarnykh neironov strukturami bazolateral'nykh iader amigdaly u koshek.

Neuronal reactivity to single stimuli applied to both the peripheral nerves and the cortex, was the same in the cat solitary tract nucleus. The 1-20 Hz stimulation frequency rendered the reactivity either tonic in character or with reduced firing rate. A high degree of convergence (80.2%) on baso-lateral nuclei neurons was established, as well as a significant cortico-fugal effect (71%) on the viscero-sensory units of these nuclei. Single shocks and tetanic stimulation of the baso-lateral amygdala evoked mostly phasic responses of the primary as well as secondary vagal neurons. Feed-back mechanisms of the amygdaloid control of the bulbar viscero-sensory units are discussed.

[Microelectrophysiologic analysis of the representation of the vagal, splanchnic, sciatic nerves and sensomotor region of the cortex in the central nucleus of the amygdala]. / Mikroélektrofiziologicheskii analiz predstavitel'stva bluzhdaiushchego, chrevnogo, sedalishchnogo nervov i sensomotornoi oblasti kory v tsentral'nom iadre amigdaly.

In anesthetized cats, a high degree of reactivity (82.2%) of neurons was found to visceral nerves and visceral stimulation (single shocks and 2, 5, 10, 20 Hz) in the central nucleus of amygdala. The majority of the neurons revealed tonic changes of spontaneous activity. A high degree (76.6%) of afferent convergence from somato-visceral systems and cortical area was found.

[Unit responses of the amygdaloid corticomedial nuclei to stimulation of the vagal, splanchnic and sciatic nerves]. / Reaktsii neironov kortiko-medial'noi gruppy iader amigdaly pri stimuliatsii bluzhdaiushchego, chrevnogo i sedalishchnogo nervov.

Bipolar recording revealed EPs of maximal amplitude in stimulation of vagus, splanchnic and sciatic nerves in the region of amygdaloid corticomedial nuclei in anesthetized cats. A high degree of reactivity (68.3%) of neurons was found in this region to single-shock stimulation of the peripheral nerves. The majority of neurons revealed tonic reactions. A high degree (57.1%) of afferent convergence from different visceral and somatic systems was found, the responses of the convergent type neurons being mostly unidirectional and identical in pattern. Sensory properties of neurons of corticomedial amygdaloid nuclei are discussed.