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  • 1
    Electronic Resource
    Electronic Resource
    Cerebellar-evoked disinhibition in dorsal deiters neurones (1968)
    Springer
    Experimental brain research 6 (1968), S. 247-264 
    Details
    ISSN: 1432-1106
    Keywords: Deiters neurones ; Disinhibition ; Cerebellum ; Cats
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Following the stimulation of cerebellar cortex, a slow depolarization developed in the neurones which were impaled with microelectrodes in the dorsal portion of the nucleus of Deiters. Characteristically, it was produced bilaterally from a wide area of the culmen and, with double shock stimulation at brief intervals, showed a marked potentiation, often in association with a later depression. After repetitive stimulation of the cerebellar cortex the slow depolarization was prolonged for a period of many seconds. Even stimulation of the spinal cord caused similar depolarization. By intracellular injection of currents and ions, the depolarization was shown to be disinhibition, i. e., removal of background inhibition. Accordingly, it was confirmed that there was a steady production of IPSPs in dorsal Deiters neurones, which diminished during the phase of disinhibition. As the possible source of these background IPSPs, the Purkinje cell axons within the nucleus of Deiters were found to be discharging rhythmically at a rate of 20–90/sec, and in fact they were depressed very effectively after cerebellar stimulation. At the same time, volleys along Purkinje cell axons produced by a testing cerebellar stimulation also were diminished, indicating a depression in the excitability of Purkinje cells.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00235127
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  • 2
    Electronic Resource
    Electronic Resource
    The origin of cerebellar-induced inhibition of Deiters neurones III. Localization of the inhibitory zone (1968)
    Springer
    Experimental brain research 4 (1968), S. 310-320 
    Details
    ISSN: 1432-1106
    Keywords: Deiters neurones ; Cerebellum ; Inhibitory zone ; Cats
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary By recording intracellularly from Deiters neurones of cats, there was a survey of those cerebellar areas that, when stimulated, produced inhibitory postsynaptic potentials (IPSPs) monosynaptically in Deiters neurones. The monosynaptic inhibitory area expanded longitudinally mainly along the ipsilateral vermal cortex of the anterior lobe. The ipsilateral cortex of the posterior lobe was also effective in inhibiting Deiters neurones though less prominently than the anterior lobe. The inhibitory fibers could be stimulated in the white matter of the cerebellum, predominantly in the ipsilateral side at rostral regions of nuclei fastigii and interpositus. It was further shown that the monosynaptic inhibition from the anterior and posterior lobes occurs chiefly in the dorsal portion of Deiters nucleus. Since in both the cerebellum and Deiters nucleus the spatial pattern of distribution of the inhibitory fibers conforms to that of the corticovestibular fibers as histologically defined, the experimental findings are in accord with the hypothesis that the cerebellar Purkinje cells are inhibitory in nature.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00235698
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  • 3
    Electronic Resource
    Electronic Resource
    The separation and identification of fractions of nonmyelinated axons from the cerebellum of the cat (1968)
    Springer
    Experimental brain research 5 (1968), S. 326-340 
    Details
    ISSN: 1432-1106
    Keywords: Subcellular fractionation ; Parallel fiber axons ; Cerebellum ; Cat
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Fractionation of the cat cerebellum has revealed that the parallel fibers of the cerebellar cortex break into two types of fragments which can be recognized in thin sections and in suspensions of negatively stained material. Fragmented material correlates well with electron micrographs of parallel fibers in situ. Parallel fiber axons and their bulbous presynaptic expansions sediment mainly into two subfractions. One unique layer consists of the intersynaptic tubular pieces of parallel fiber axons. Another layer is enriched in the synaptic portions which make contact with Purkinje spines. The possible contaminants of these fractions are discussed. These fractions may permit analysis of the chemical organization of conducting vis à vis synaptic membranes from a known anatomical source. This material was presented as a preliminary report at the Sixth Annual Meeting of the American Society for Cell Biology, November 1966, and is contained in J. Cell. Biol. 31, 52A, 1966.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00235907
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  • 4
    Electronic Resource
    Electronic Resource
    Thiophen induced granule cell necrosis in the rat cerebellum an electron microscopic study (1968)
    Springer
    Experimental brain research 6 (1968), S. 49-68 
    Details
    ISSN: 1432-1106
    Keywords: Cerebellum ; Granule cell ; Necrosis ; Synapse
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Granule cell necrosis was produced in rats by thiophen injection. The earliest detectable change was the formation of blebs in the perinuclear cisternae. This was followed by precipitation of the nuclear chromatin and rupture of the cell membrane. Removal of the cell debris was accomplished by phagocytic cells in the walls of small blood vessels, hematogenous macrophages and astrocytes. Many of the mossy fiber endings and some of the Golgi II cells degenerated secondarily. The degenerated presynaptic contacts of the parallel fibers were replaced by processes of the Bergmann glia which completely surrounded the Purkinje cell spines. These spines retained their usual appearance including the usual thickening of the post synaptic membrane. Implications of these findings are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00235446
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  • 5
    Electronic Resource
    Electronic Resource
    Ganglioside analyses of serial cryostat sections through Ammon's horn and cerebellar folia (1968)
    Springer
    Experimental brain research 5 (1968), S. 32-44 
    Details
    ISSN: 1432-1106
    Keywords: Gangliosides ; Hippocampus ; Cerebellum ; Synapses ; Neuronal membranes
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary The distribution of gangliosides in serial cryostat sections of area CA2 of the ox hippocampus cut parallel to the ventricular surface and of a cerebellar folium cut parallel to the pial surfaces have been determined utilizing a fluorimetric method for analysis of N-acetylneuraminic acid. Wide differences in the ganglioside content, even in adjacent sections, were found within the various laminae, particularly in the molecular layers of the hippocampus and cerebellum. The variations in ganglioside concentrations largely disappeared when sections were cut so as to include all the laminae in one section. Average ganglioside concentrations per unit of dry weight were highest in the granular cell and molecular layers of the cerebellum, but in the hippocampus the highest values were obtained just below the stratum granulare of the fascia dentata. The results indicate that gangliosides are not uniformly distributed throughout the neuron but are concentrated in regions densely supplied with synaptic endings on both cell bodies and dendrites.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00239903
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  • 6
    Electronic Resource
    Electronic Resource
    Distribution of gangliosides, glycoprotein-NANA and acetylcholnesterase in axonal and synaptosomal fractions of cat cerebellum (1969)
    Springer
    Experimental brain research 8 (1969), S. 97-104 
    Details
    ISSN: 1432-1106
    Keywords: Axons ; Synaptosomes ; Gangliosides ; Glycoproteins ; Acetylcholinesterase ; Cerebellum
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Mild homogenization of the cat cerebellum and centrifugation of the resultant particulate matter yielded a crude mitochondrial fraction which was further fractionated by sucrose-density gradient centrifugation. The fractions obtained were examined under the electron microscope. Fraction P2A contained large numbers of myelin fragments. Fraction P2B was enriched in segments of unmyelinated axons. Fraction P2C was enriched in axons with their synaptic enlargements. Fractions P2D and P2E were composed predominately of free mitochondria, although axonal segments with bulbar enlargements corresponding to synaptosomes were also seen. Fractions enriched in axons were characterized by a high concentration of gangliosides and acetylcholinesterase (per mg protein). Fractions that contain axons with synaptic enlargements were similarly enriched in these constituents. Glycoprotein-NANA was rather widely distributed, but the concentration of glycoprotein-NANA, per mg protein, was somewhat higher in those fractions that contain axons with attached synaptic enlargements. The distribution of gangliosides and glycoproteins differed so that the ratio of glycoprotein-NANA to ganglioside-NANA increased with increasing particle size or density.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00234532
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  • 7
    Electronic Resource
    Electronic Resource
    Nature of the cerebellar influences upon the red nucleus neurones (1968)
    Springer
    Experimental brain research 4 (1968), S. 292-309 
    Details
    ISSN: 1432-1106
    Keywords: Red nucleus ; Cerebellum ; Disfacilitation ; Cats
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Large cells in the red nucleus of cats were impaled with glass microelectrodes. Under light Nembutal anesthesia it was found that stimulation of the cerebellar cortex produced hyperpolarization in their membrane. Unlike the inhibitory postsynaptic potentials, this hyperpolarization decreased when the membrane was depolarized by passage of currents through the microelectrode, and it increased during application of hyperpolarizing currents: Hence the hyperpolarization is presumed to be produced by removal of tonically impinging excitatory postsynaptic potentials, in the manner of “disfacilitation”. In accordance with the above view, spontaneously arising small EPSPs disappeared during the phase of the hyperpolarization. The source of tonic impingement of excitatory impulses onto the red nucleus was found in the interpositus nucleus. The cells in this nucleus were discharging impulses at frequencies of 50–100/sec which were suppressed after the cerebellar stimulation, presumably via Purkinje cell axons, a depression in the excitability of the interpositus neurones being revealed at the same time. Following the depression, the excitability and impulse discharges of the interpositus neurones were enhanced, and correspondingly there was a late depolarization in the red nucleus neurones. During stimulation of the inferior olive and even of the spinal cord, disfacilitation and late facilitation occurred similarly through the interpositus nucleus, though with longer latencies.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00235697
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  • 8
    Electronic Resource
    Electronic Resource
    The effects of unilateral and bilateral cortical ablations of the cerebellar hemisphere upon learning and retention of an instrumental light-dark discrimination task in adult cats (1969)
    Springer
    Pflügers Archiv 310 (1969), S. 101-108 
    Details
    ISSN: 1432-2013
    Keywords: Cerebellärer Kortex ; Lernen am Erfolg ; Licht-Dunkelheit-Diskrimination ; Cerebellum ; Instrumental Conditioning ; Light-Dark Discrimination
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Summary Ten adult cats were used as subjects in a study which was designed to investigate the effects of cortical ablations of the cerebellar hemispheres upon learning and retention of a light-dark discrimination task. The discrimination task was instrumentally conditioned in food-deprived cats. The results of this study showed that unilateral or bilateral ablations of the cerebellar hemispheres have no effects upon retention of a learned discrimination task. The data further indicated that bilateral ablations of the cerebellar hemispheres seem to retard learning of a discrimination task during the first 5 days of the learning period. This latter effect was interpreted to be due to a dynamic period of compensation, during which, asCarrea andMettler [3] assumed, the cerebral cortex takes over the functions of the ablated parts of the cerebellum.
    Notes: Zusammenfassung Zehn Katzen wurden als Versuchstiere in einem Experiment benutzt, welches die Einflüsse der Entfernung der corticalen cerebellären Hemisphären auf das Erlernen und Behalten einer Licht-Dunkelheit Diskrimination untersuchte. Die Diskriminationsaufgabe wurde bei hungrigen Katzen nach der Skinner Methode durchgeführt. Die Ergebnisse dieser Studie zeigten, daß unilaterale oder bilaterale Entfernungen der cerebellären corticalen Hemisphären keinen Einfluß auf das Behalten der erlernten Diskriminationsaufgabe hatten. Dagegen schien die bilaterale Entfernung der cerebellären corticalen Hemisphären das Erlernen der Diskriminationsaufgabe zu verzögern, besonders während der ersten 5 Tage der Lernperiode. Es wurde angenommen, daß dieser einfluß auf einer dynamischen Kompensationsperiode beruht, während der, wieCarrea undMettler [3] vermuteten, der cerebrale Kortex die Funktion der entfernten Teile des Kleinhirns übernimmt.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00586767
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