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PubMed2005

[Sensory innervation of the brain (primary interoceptive brain neurons and their asynaptic dendrites)].

This paper summarizes the author's personal research and the literature data on the sensory innervation of the brain. The following cells were analyzed as presumable primary sensory neurons: ciliated brain neurons, supraependymal plexus and cerebrospinal fluid-contacting intraependymal neurons, Cajal-Retzius neurons of the marginal layer of the cerebral cortex, brain and spinal cord Dolgo-Saburov paravasal neurons, Lugaro cells of the cerebellar cortex, some NO- and synthase-positive cells of the cerebral cortex, asynaptic dendrites of which innervate the precapillary space. Due to the painlessness of the brain and visceral parenchyma, containing local primary sensory neurons, similar to intramural metasympathetic type II Dogiel sensory cells, the hypothesis is formulated on the participation of brain and other intraorgan tissue receptors in the short "autonomic" reflex arcs, which provide only for the local metabolism control, but not for the pain reactions.

Animals↗
PubMed1977

[Participation of interoceptive afferent excitations in sensory integration processes of cat visual cortex neurons].

In experiments on cats immobilized with diplacine it is shown that stimulation of the vagal and splanchnic nerves exerts a substantial influence on the neuronal background activity of field 17 in the brain cortex. Neuronal responses as prolonged tonic changes in impulse frequency were seen more often. Complex phasic neuronal responses with steady inhibitory periods and periods of activation appeared more rarely. The development of phasic reactions could begin both with activation and initial inhibition of the activity. Predominantly excitatory responses resulted from the splanchnic nerve stimulation. They could be also seen during somatic stimulations. The degree of neuronal involvement into the responses and their intensity increased by trains of stimuli. Visceral and somatic influences on the visual cortical neurons are shown to be mediated by the lateral hypothalamus and midbrain reticular formation.

Animals↗