Unit responses in the anterior and posterior hypothalamus to stimulation of the splanchnic and sciatic nerves and to photic stimulation

Autor: O. G. Baklavadzhyan, K. G. Bagdasaryan
Rok vydání: 1977
Předmět:
Zdroj: Neurophysiology. 8:213-217
ISSN: 1573-9007
0090-2977
DOI: 10.1007/bf01064618
Popis: By extracellular recording of spike discharges the sensory properties of neurons of the anterior and posterior regions of the cat hypothalamus were studied during stimulation of the splanchnic and sciatic nerves and during photic stimulation. Hypothalamic neurons were shown to be characterized by wide convergence of heterosensory excitation: 68% of spontaneously active hypothalamic neurons responded to somatovisceral and photic stimulation. Some posterior hypothalamic neurons responded to somatovisceral stimulation but not to photic stimulation. Neurons responding only to photic stimulation were found in the anterior hypothalamus; no neurons responding only to visceral stimulation were found in the hypothalamus. Total convergence of somatic and visceral afferentation of neurons of the posterior and anterior hypothalamus was observed. Mostly responses of phasic type were obtained to stimulation of all modalities. The study of the quantitative ratio between responses of excitatory and inhibitory types showed that the former predominate. The principles governing the functional organization of hypothalamic afferent systems are discussed.
Databáze: OpenAIRE
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