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1.

001-es BibID:BIBFORM029076
Első szerző:Antal Miklós (orvos, anatómus)
Cím:Synapses on motoneuron dendrites in the brachial section of the frog spinal cord : a computer-aided electron microscopic study of cobalt-filled cells / M. Antal, R. Kraftsik, G. Székely, H. Van der Loos
Dátum:1992
Megjegyzések:Cobalt-labelled motoneuron dendrites of the frog spinal cord at the level of the second spinal nerve were photographed in the electron microscope from long series of ultrathin sections. Three-dimensional computer reconstructions of 120 dendrite segments were analysed. The samples were taken from two locations: proximal to cell body and distal, as defined in a transverse plane of the spinal cord. The dendrites showed highly irregular outlines with many 1-2 microns-long 'thorns' (on average 8.5 thorns per 100 microns 2 of dendritic area). Taken together, the reconstructed dendrite segments from the proximal sites had a total length of about 250 microns; those from the distal locations, 180 microns. On all segments together there were 699 synapses. Nine percent of the synapses were on thorns, and many more close to their base on the dendritic shaft. The synapses were classified in four groups. One third of the synapses were asymmetric with spherical vesicles; one half were symmetric with spherical vesicles; and one tenth were symmetric with flattened vesicles. A fourth, small class of asymmetric synapses had dense-core vesicles. The area of the active zones was large for the asymmetric synapses (median value 0.20 microns 2), and small for the symmetric ones (median value 0.10 microns 2), and the difference was significant. On average, the areas of the active zones of the synapses on thin dendrites were larger than those of synapses on large calibre dendrites. About every 4 microns 2 of dendritic area received one contact. There was a significant difference between the areas of the active zones of the synapses at the two locations. Moreover, the number per unit dendritic length was correlated with dendrite calibre. On average, the active zones covered more than 4% of the dendritic area; this value for thin dendrites was about twice as large as that of large calibre dendrites. We suggest that the larger active zones and the larger synaptic coverage of the thin dendrites compensate for the longer electrotonic distance of these synapses from the soma.
Tárgyszavak:Orvostudományok Elméleti orvostudományok idegen nyelvű folyóiratközlemény külföldi lapban
egyetemen (Magyarországon) készült közlemény
Megjelenés:Journal of Neurocytology. - 21 : 1 (1992), p. 34-49. -
További szerzők:Kraftsik, R. Székely György (1926-2017) (neurobiológus) Loos, H. van der
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2.

001-es BibID:BIBFORM029049
Első szerző:Antal Miklós (orvos, anatómus)
Cím:Phagocytosis of myelin sheath fragments by dendrites / M. Antal, G. Székely
Dátum:1987
ISSN:0014-4819
Megjegyzések:In serial ultrathin sections of the frog spinal cord, profiles of dendritic appearance were identified that contained myelin fragment inclusions and received synaptic contacts. In a number of cases it could be established that the inclusions were derived from adjacent myelin sheaths. It is suggested that the phenomenon may refer to a turnover of the myelin sheath in which the detached myelin fragments are eliminated by dendrites.
Tárgyszavak:Orvostudományok Elméleti orvostudományok idegen nyelvű folyóiratközlemény külföldi lapban
egyetemen (Magyarországon) készült közlemény
Megjelenés:Experimental Brain Research. - 66 : 3 (1987), p. 517-521. -
További szerzők:Székely György (1926-2017) (neurobiológus)
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3.

001-es BibID:BIBFORM029046
Első szerző:Antal Miklós (orvos, anatómus)
Cím:Tectal neurons of the frog : intracellular recording and labeling with cobalt electrodes / M. Antal, N. Matsumoto, G. Székely
Dátum:1986
ISSN:0021-9967
Tárgyszavak:Orvostudományok Elméleti orvostudományok idegen nyelvű folyóiratközlemény külföldi lapban
egyetemen (Magyarországon) készült közlemény
Megjelenés:Journal of Comparative Neurology. - 246 (1986), p. 238-253. -
További szerzők:Matsumoto, N. Székely György (1926-2017) (neurobiológus)
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4.

001-es BibID:BIBFORM028816
Első szerző:Antal Miklós (orvos, anatómus)
Cím:Distal dendrites of frog motoneurons : a computer-aided electron microscopic study of cobalt-filled cells / Antal M., Kraftsik R., Székely G., Van der Loos H.
Dátum:1986
Megjegyzések:With the aid of the cobalt labelling technique, frog spinal cord motor neuron dendrites of the subpial dendritic plexus have been identified in serial electron micrographs. Computer reconstructions of various lengths (2.5-9.8 micron) of dendritic segments showed the contours of these dendrites to be highly irregular, and to present many thorn-like projections 0.4-1.8 micron long. Number, size and distribution of synaptic contacts were also determined. Almost half of the synapses occurred at the origins of the thorns and these synapses had the largest contact areas. Only 8 out of 54 synapses analysed were found on thorns and these were the smallest. For the total length of reconstructed dendrites there was, on average, one synapse per 1.2 micron, while 4.4% of the total dendritic surface was covered with synaptic contacts. The functional significance of these distal dendrites and their capacity to influence the soma membrane potential is discussed.
Tárgyszavak:Orvostudományok Elméleti orvostudományok idegen nyelvű folyóiratközlemény külföldi lapban
Megjelenés:Journal of Neurocytology. - 15 : 3 (1986), p. 303-310. -
További szerzők:Kraftsik, R. Székely György (1926-2017) (neurobiológus) Loos, H. van der
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5.

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)
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6.

001-es BibID:BIBFORM029495
Első szerző:Birinyi András (anatómus, neurobiológus)
Cím:The extent of the dendritic tree and the number of synapses in the frog motoneuron / Birinyi A., Antal M., Wolf E., Székely G.
Dátum:1992
ISSN:0953-816X
Megjegyzések:Frog motoneurons were intracellularly labelled with cobaltic lysine in the brachial and the lumbar segments of the spinal cord, and the material was processed for light microscopy in serial sections. With the aid of the neuron reconstruction system NEUTRACE, the dendritic tree of neurons was reconstructed and the length and surface area of dendrites measured. The surface of somata was determined with the prolate - oblate average ellipsoid calculation. Corrections were made for shrinkage and for optical distortion. The mean surface area of somata was 6710 microm2; lumbar motoneurons were slightly larger than brachial motoneurons. The mean length of the combined dendritic tree of brachial neurons was 29 408 microm and that of lumbar neurons 46 806 microm. The mean surface area was 127 335 microm2 in brachial neurons, and 168 063 microm2 in lumbar neurons. The soma - dendrite surface area ratio was 3 - 5% in most cases. Dendrites with a diameter of </= 1.0 microm constituted approximately 75% of the combined dendritic length in most of the neurons. Unlike in the cat, there was no correlation between the size of stem dendrites and the extent of daughter branches. From the synaptic density estimated in earlier electron microscope investigations of frog motoneuron dendrites (Antal et al., J. Neurocytol., 15, 303 - 310, 1986; 21, 34 - 49, 1992), and from the present data, the number of synapses on the dendritic tree was calculated. The calculations indicated 26 949 synapses on the smallest and 61 519 synapses on the largest neuron if the synaptic density was multiplied by the length of the dendritic tree. If the synaptic density was multiplied by the surface area of the dendritic tree the calculation yielded 23 337 synapses for the smallest and 60 682 synapses for the largest neuron. More than 60% of the combined surface area of dendrites was >600 microm from the soma. This suggests that about two-thirds of the synapses impinged upon distant dendrites >600 microm from the soma. The efficacy of synapses at these large distances is investigated on model neurons in the accompanying paper
Tárgyszavak:Orvostudományok Természettudományok Biológiai tudományok Elméleti orvostudományok idegen nyelvű folyóiratközlemény külföldi lapban
egyetemen (Magyarországon) készült közlemény
Megjelenés:European Journal Of Neuroscience. - 4 : 11 (1992), p. 1003-1012. -
További szerzők:Antal Miklós (1951-) (orvos, anatómus) Wolf Ervin (1961-) (fizikus, neurobiológus) Székely György (1926-2017) (neurobiológus)
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7.

001-es BibID:BIBFORM028802
Első szerző:Görcs T.
Cím:An improved cobalt labeling technique with complex compounds / Görcs T., Antal M., Oláh É., Székely G.
Dátum:1979
ISSN:0001-5288
Megjegyzések:Results of axonal labelings with CoCl2, cobaltous lysine and cobaltic lysine complexes are compared on dorsal roots and nerves of the spinal cord and brain stem in the living frog. The most satisfactory staining of fibres and terminals is given by CoCl2; its application however, is limited by its rather short (6--10 mm) axonal transport. Cobaltous lysine is transported somewhat better, but it gives a poor fibre staining in the spinal cord. The axonal transport of cobaltic lysine is the best, covering a distance of 40--50 mm. Combination of cobaltic lysine with 2--5% dimethyl sulphoxide greatly enhances the axonal uptake of cobalt and extends the distance of transport to 70--80 mm. It is assumed that better transport of cobalt complexes is achieved by their less toxic effect on the nerve cell.
Tárgyszavak:Orvostudományok Elméleti orvostudományok idegen nyelvű folyóiratközlemény külföldi lapban
Megjelenés:Acta Biologica Academiae Scientiarum Hungaricae. - 30 : 1-2 (1979), p. 79-86. -
További szerzők:Antal Miklós (1951-) (orvos, anatómus) Oláh Éva (1943-2019) (gyermekgyógyász, klinikai genetikus) Székely György (1926-2017) (neurobiológus)
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8.

001-es BibID:BIBFORM029062
Első szerző:Shupliakov, Oleg
Cím:Recurrent dorsal root potentials and motoneuron morphology in the frog spinal cord / O. V. Shupliakov, M. Antal, G. Székely
Dátum:1990
ISSN:0304-3940
Megjegyzések:About one third of motoneurons stimulated intracellularly evoked dorsal root potentials (DRP) in the lumbar segments of the isolated and perfused frog spinal cord. Axon collaterals were found in one of the 22 motoneurons filled with HRP (horseradish peroxidase) through the stimulating electrode. In further experiments injecting individual motoneurons with cobalt, and filling the ventral roots with HRP or cobalt, the frequency of occurrence of axon collaterals was about 2% of the number of labelled motor cells. It is suggested that the presence of motor axon collaterals is not indispensable in the generation of the DRP evoked by ventral root or motor cell stimulation.
Tárgyszavak:Orvostudományok Elméleti orvostudományok idegen nyelvű folyóiratközlemény külföldi lapban
egyetemen (Magyarországon) készült közlemény
Megjelenés:Neuroscience Letters. - 117 : 3 (1990), p. 289-294. -
További szerzők:Székely György (1926-2017) (neurobiológus) Antal Miklós (1951-) (orvos, anatómus)
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9.

001-es BibID:BIBFORM030099
Első szerző:Székely György (neurobiológus)
Cím:Segregation of muscle and cutaneous afferent fibre terminals in the brachial spinal cord of the frog / Székely G., Antal M.
Dátum:1984
Megjegyzések:Separate filling with cobalt of individual nerves of the arm revealed that cutaneous afferent fibres terminate in an oval-shaped area at the superficial part of the dorsal horn, while muscle afferent fibres terminate in a triangle-shaped area lying deeper in the gray substance of the frog spinal cord. In a few cases, flexor muscle afferents also emit a small number of short collaterals to the ventral part of the oval-shaped area. In the medulla, cuaneous afferents project onto the dorsal part and muscle afferents onto the ventral part of the cuneate nucleus. Muscle afferents only terminate in the cerebellum.
Tárgyszavak:Orvostudományok Elméleti orvostudományok idegen nyelvű folyóiratközlemény külföldi lapban
Megjelenés:Journal of Hirnforsch. - 25 : 6 (1984), p. 671-675. -
További szerzők:Antal Miklós (1951-) (orvos, anatómus)
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10.

001-es BibID:BIBFORM028826
Első szerző:Székely György (neurobiológus)
Cím:Problems of the development of neuronal interconnections / Székely G., Antal M., Nagy I.
Dátum:1990
Tárgyszavak:Orvostudományok Elméleti orvostudományok idegen nyelvű folyóiratközlemény külföldi lapban
Megjelenés:Ergebnisse der Experimentellen Medizin. - 53 (1990), p. 210-215. -
További szerzők:Antal Miklós (1951-) (orvos, anatómus) Nagy I. (orvos)
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11.

001-es BibID:BIBFORM028806
Első szerző:Székely György (neurobiológus)
Cím:The termination of cutaneous nerves in the dorsal horn of the spinal cord in normal and in skin-rotated frogs / Székely G., Matesz K., Baker R. E., Antal M.
Dátum:1982
Megjegyzések:Following transganglionic transport of cobaltic lysine applied to the cut end of cutaneous nerves, the central terminal arbours were filled to such an extent that it was possible to visualize the dermatomal projection upon the dorsal horn in unoperated and in skin-rotated frogs. Sensory nerves of the trunk skin terminate in an oval-shaped area which probably corresponds to laminae 1-3 (or 1-4) in the mammalian spinal cord. One type of terminating collateral had a restricted terminal field either in the medial, or in the lateral, part of the oval-shaped area. Another type ended with a large terminal arbour covering almost the total extent of the oval shaped area. These terminal arbours were found for both the dorsal and the ventral cutaneous nerves. Dorsal cutaneous nerves projected preferentially to the lateral part, while ventral cutaneous nerves projected to the medial part, but both nerves sent a significant contingent of collaterals to the whole extent of the oval-shaped area. A rearrangement of the central projection patterns of the dorsal cutaneous nerves, consistently mediating misdirected responses, was not observed in skin-rotated frogs. Collaterals of trunk skin nerves terminated exclusively in the thoracic segments; they did not enter the limb-innervating (brachial and lumbosacral) segments of the spinal cord. The results corroborate the crossed pattern of sensory input in the dermatomal projection. The large, extensively overlapping, areas of termination of individual skin nerves suggest that wiping responses mediated by these nerves should be regarded as complex behaviour released from a preprogrammed centre rather than a reflex arc in which the presence specificity would be determined by wiring specificity.
Tárgyszavak:Orvostudományok Elméleti orvostudományok idegen nyelvű folyóiratközlemény külföldi lapban
Megjelenés:Experimental Brain Research. - 45 : 1-2 (1982), p. 19-28. -
További szerzők:Matesz Klára (1949-) (anatómus, neurobiológus) Baker, R. E. Antal Miklós (1951-) (orvos, anatómus)
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12.

001-es BibID:BIBFORM028805
Első szerző:Székely György (neurobiológus)
Cím:Different dendritic arborization patterns of motoneurons in various places of the rat's lumbosacral spinal cord / Székely G., Matesz C., Antal M.
Dátum:1980
Megjegyzések:With the aid of the cobalt labelling technique the distribution and morphology of motoneurons were studied in the 2nd and 3rd lumbar segments of the rat's spinal cord. On the basis of arborization patterns of their dendritic arbors, motoneurons can be classified into six groups. 1. Large stellate-form neurons occupy the centre of the ventral horn. 2. Marginal neurons are found at the ventrolateral border of the ventral horn. 3. Horizontal neurons form a small group in the dorsolateral corner of the ventral horn. 4. Upper stellate neurons situate in the dorsal part of the ventral horn. 5. Triangular neurons constitute a compact group in the medial corner of the ventral horn. 6. Unclassifiable neurons form a scattered group in the ventral part of the ventral horn. The arborization pattern of dendrites of adjacent neurons belonging to the same group frequently resemble one another to such an extent that they are called "twin" neurons and derive probably from a common cell lineage. One member of such twin pairs is often the small counterpart of its much bigger mate. Dendrites originating from the same morphological type of motoneurons and running in the same direction, aggregate into smaller or larger bundles. The majority of dendritic bundles is oriented in, or close to, the transversal plane of the spinal cord; a significant number of longitudinal dendrites are found only in the group of triangular neurons innervating the axial musculature. The possibility is discussed that the differentiation of the different forms is determined both by genetic and epigenetic factors during morphogenesis.
Tárgyszavak:Orvostudományok Elméleti orvostudományok idegen nyelvű folyóiratközlemény külföldi lapban
Megjelenés:Acta biologica Academiae Scientiarum Hungaricae. - 31 : 1-3 (1980), p. 305-319. -
További szerzők:Matesz Klára (1949-) (anatómus, neurobiológus) Antal Miklós (1951-) (orvos, anatómus)
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