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001-es BibID:BIBFORM028803
Első szerző:Antal Miklós (orvos, anatómus)
Cím:Longitudinal extent of dorsal root fibres in the spinal cord and brain stem of the frog / Antal M., Tornai I., Székely G.
Dátum:1980
ISSN:0306-4522
Megjegyzések:The longitudinal arrangement of dorsal root fibres was investigated with a modified cobalt labelling technique in the spinal cord and brain stem of frogs. The topographical order of dorsal root fibres in the dorsal white column closely resembles the well-known scheme of the mammalian spinal cord. A significant difference between frogs and mammals is the extension of fibres up to the cerebellar plate. The ascending fibres of different origin are organized in concentric rings in the medulla. An oval-shaped area and a triangular area in the dorsal horn, and the motor horn, receive fibre collaterals in the spinal cord. Thoracic dorsal root fibres terminate exclusively in the oval-shaped area. Fibre terminations clearly outline the dorsal column nuclei which begin in the obex region and end at the level of the glossopharyngeal nucleus. The spinal nucleus of the trigeminus is richly supplied by both thin and thick calibre dorsal root fibres in its entire rostrocaudal extension. Two parts of the reticular formation receive dorsal root fibres; the first is in the dorsal gray matter ventral and lateral to the solitary fascicle in the medulla, the second is the lateral reticular zone. In the vestibular region, the medial, lateral and superior vestibular nuclei are innervated by dorsal root fibres. The granular layer of the cerebellum receives a significant contingent of dorsal root fibres. Fibres terminating in the vestibular region and in the cerebellum arise from limb-innervating spinal ganglia. The results indicate a close similarity in the longitudinal arrangement of dorsal root fibres in frogs and in higher vertebrates. The several collaterals that terminate in the hindbrain may modulate the function of the receiving structures. On the basis of present and previous findings the aggregation of primary sensory fibres and the convergence of their terminations are surveyed in the hindbrain.
Tárgyszavak:Orvostudományok Elméleti orvostudományok idegen nyelvű folyóiratközlemény külföldi lapban
egyetemen (Magyarországon) készült közlemény
Megjelenés:Neuroscience. - 5 : 7 (1980), p. 1311-1322. -
További szerzők:Tornai István (1954-) (belgyógyász, gasztroenterológus) Székely György (1926-2017) (neurobiológus)
Internet cím:Intézményi repozitóriumban (DEA) tárolt változat
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2.

001-es BibID:BIBFORM034825
Első szerző:Tornai István (belgyógyász, gasztroenterológus)
Cím:Heterogeneous regeneration of motor fibers following union of the ventral and the dorsal roots in frogs / I. Tornai, L. Urbán, G. Székely
Dátum:1983
ISSN:0236-5383
Megjegyzések:In frogs, the dorsal and ventral roots of one of the large lumbar segments (8th or 9th) of the spinal cord were severed and the central stumps were united in order to let motor fibers of the ventral root regenerate into the spinal cord via the dorsal root. After a survival period of 7 to 30 weeks, regeneration was tested in stimulation experiments and in histological investigations. Stimulation experiments involved recordings of field potentials and ventral root potentials evoked by stimulation of the regenerated dorsal root. Appreciable responses could be recorded only from a fraction of the animals investigated. Histological investigation following cobalt labelling of the united dorsal root revealed the presence of a significant amount of regenerated fibers. The arborization pattern of some regenerated fibers resembled the muscle end-plate formation. The results indicate that cholinergic motor fibers are able to replace, to a limited extent, dorsal root fibers. This suggests that there is not a strict receptor-nerve specificity in the sense that a synaptic site can be exclusively stimulated by the appropriate mediator, but rather a preferential selection for the appropriate connection. This preference is higher when both the morphology and the chemistry of the presynaptic structure match with the postsynaptic medium.
Tárgyszavak:Orvostudományok Klinikai orvostudományok idegen nyelvű folyóiratközlemény hazai lapban
egyetemen (Magyarországon) készült közlemény
Megjelenés:Acta Biologica Hungarica. - 34 : 1 (1983), p. 45-54. -
További szerzők:Urbán László (London, UK) Székely György (1926-2017) (neurobiológus)
Internet cím:Intézményi repozitóriumban (DEA) tárolt változat
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