[A structural organization of the sensory projections on a reticular formation of the brain stem].
The animal experiments were performed by the cutting the sensory afferent tracts which had the projections on the reticular formation (RF) of brain stem, namely--visual, acoustic and taste tracts. Brain was investigated by methods of Marki, Nauta, Fink-Haimer. A quantitative evaluation of the voluminous fractions of neurons and gla was carried out by using "Classimat" device. Capillary density was also counted. A morphologic substrate for the conduction of the specific influences was found in form of both afferent fibers entering in brain stem and the cell groups associated with them. Between the specific brain stem and reticular structures of medulla oblongata, brain stem and midbrain (n.cuneiformis, n. tegmenti pedunculo-ponticus, n.centralis oralis and caudalis pontis, n. papillioformis, n. parabrachialis medialis and n. parvocellularis) intermediate zones were determined which were localized on the junction between sensory and reticular nuclei and had specific afferentation. Intermediate zones were also found in RF between the nuclei in both oral-caudal and mediolateral directions. An idea was formulated about the differencies in a structural organization of RF in medulla oblongata, brain stem and midrain, that were conditioned by a multicentral localization of RF functions.
Amunts
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D000818:Animals; D001933:Brain Stem / Q000033:anatomy & histology* / Q000502:physiology*; D002415:Cats; D004285:Dogs; D017950:Ganglia, Sensory / Q000502:physiology* / Q000601:surgery; D009410:Nerve Degeneration / Q000209:etiology; D009475:Neurons, Afferent / Q000502:physiology*; D011183:Postoperative Complications / Q000209:etiology; D012154:Reticular Formation / Q000033:anatomy & histology* / Q000502:physiology*