Summary
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1.
The effects of iontophoretically applied cholinomimetic substances and of biogenic amines were tested in movement sensitive neurons of the colliculus superior and in neurons of the subtectal mesencephalic reticular formation.
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2.
Most collicular neurons were strongly excited by Glutamate which prevented neuronal adaptation and restored excitability in totally habituated neurons. GABA proved to be a strong depressant of collicular neurons.
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3.
Serotonine, Noradrenaline and Dopamine effectively depressed spontaneous, Gl-induced and stimulus driven activity of collicular units. Some units were selectively responsive to Serotonine, or to Catecholamines; others responded equally well to either group of substances. This suggests the existence of separate Serotonine respectively Catecholamine receptors.
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4.
Only a small proportion of collicular units (7%) was excited or depressed by cholinomimetic substrances.
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5.
The pharmacological properties of reticular units corresponded essentially to those of collicular neurons: GABA, Serotonine, Noradrenaline and Dopamine proved to be strong depressants of spontaneous, Gl-induced and stimulus driven activity. Selective responsiveness to Serotonine or to Catecholamines was found in some neurons. Cholinomimetic substances failed to influence a significant proportion of reticular units. Glutamate application produced strong excitation and led to an increase of somato-sensory receptive fields.
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References
Bell, C., Sierra, G., Buenda, N., Segundo, J. P.: Sensory properties of neurons in the mesencephalic reticular formation. J. Neurophysiol.27, 961–987 (1964).
Bradley, P. B., Wolstencroft, J. H.: Actions of drugs on single neurons in the brainstem. Brit. med. Bull.21, 15–18 (1965).
Costa, E., Aprison, M. H.: Studies on the 5-hydroxytryptamine (serotonine) content in human brain. J. nerv. ment. Sis.126, 289–293 (1958).
Curtis, D. R.: Central synaptic transmitters. In: Basic mechanisms of epilepsies. Eds. H. H. Jasper, A. Ward and A. Pope. Boston: Little, Brown and Comp. 1969.
—, Koizumi, K.: Chemical transmitter substances in the brainstem of cat. J. Neurophysiol.24, 80–90 (1961).
Dewhurst, W. G., Marley, E.: Differential effect of sympathomimetic amines on the central nervous system. In: Animal behaviour and drug action. Ciba Fundation Symposium. Eds. Steinberg and Knight. London: Churchill 1964.
French, I. D., Verzeano, M., Magoun, H. W.: An extralemniscal sensory system in the brain. Arch. Neurol. Psychiat. (Chic.)69, 505–518 (1953).
Fuxe, K.: The distribution of monoamine terminals in the central nervous system. Acta physiol. scand.64, Suppl. 247 (1965).
Graham, L. T., Shank, R. P., Werman, R., Aprison, M. H.: Distribution of some synaptic transmitter suspects in cat spinal cord: Glutamic acid, aspartic acid, γ-butyric acid, glycine and glutamine. J. Neurochem.14, 465–472 (1967).
Herz, A., Wickelmayer, M., Nacimiento, A.: Über die Herstellung von Mehrfachelektroden für Mikroelektrophorese. Pflügers Arch. ges. Physiol.284, 95–98 (1965).
Hösli, L., Tebecis, A.: Actions of aminoacids and convulsants on bulbar reticular neurons. Exp. Brain Res.11, 111–127 (1970).
Hösli, L., Tebecis, A. Schönwetter, M.: A comparison of the effects of monamines on neurons of the bulbar reticular formation. Brain Res. (in press).
Hoffmann, K. P., Straschill, M.: Influences of cortico-tectal and intertectal connections on visual responses in the cat's superior colliculus. Exp. Brain Res. (in press).
Horn, G., Hill, R. M.: Responsiveness to sensory stimulation of units in the superior colliculus and subjacent tecto-tegmental regions of the rabbit. Exp. Neurol.14, 199–223 (1966).
Ilwain, J. T., Buser, B.: Receptive fields of single cells in the cat's superior collicus. Exp. Brain Res.5, 314–325 (1968).
Jouvet, M.: Insomnia and decrease of cerebral 5-hydroxytryptamine after destruction of the raphe system in the cat. In: Advances in pharmacology, vol. 6B, pp. 265–282. Eds. Garattini and Shore. New York: Academic Press 1968.
Kawai, N., Yamamoto, C.: Effects of 5-hydrocytryptamine, LSD and related compounds on electrical activities evoked in vitro in thin sections from the superior colliculus. Int. J. Neuropharmacol.8, 437–449 (1969).
McLennan, H., Huffmann, R. D., Marshall, K. C.: Patterns of excitations of thalamic neurons by aminoacids and by acetylcholine. Nature (Lond.)219, 387–388 (1968).
Robert, F., Cuenod, M.: Electrophysiology of the intertectal commissures in the pigeon. II. Inhibitory interaction. Exp. Brain Res.9, 123–136 (1969).
Roberts, M. H., Straugham, D. W.: Excitation and depression of cortical neurons by 5-hydrocytryptamine. J. Physiol. (Lond.)193, 269–294 (1967).
Shute, C. D., Lewis, P. R.: The ascending cholinergic reticular system: Neocortical, olfactory and subcortical projections. Brain90, 497–520 (1967).
Sprague, J. M., Marchiafava, P., Rizzolatti, G.: Unit response to visual stimuli in the superior colliculus of the unanaesthetized mid-pontine cat. Arch. ital. Biol.106, 169–193 (1968).
Sterling, P., Wickelgreen, B.: Visual receptive fields in the superior colliculus of the cat. J. Neurophysiol.32, 1–16 (1969).
Straschill, M.: Effect ofd-Amphetamine on the activity of single neurons of the cat's tectum opticum. Experientia (Basel)52, 373 (1969).
— Hoffmann, K. P.: Functional aspects of localisation in the cat's tectum opticum. Brain Res.13, 274–283 (1969).
— Taghavy, A.: Neuronale Reaktionen im Tectum opticum der Katze auf bewegte und stationäre Lichtreize. Exp. Brain Res.3, 353–367 (1967).
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Straschill, M., Perwein, J. Effect of iontophoretically applied biogenic amines and of cholinomimetic substances upon the activity of neurons in the superior colliculus and mesencephalic reticular formation of the cat. Pflugers Arch. 324, 43–55 (1971). https://doi.org/10.1007/BF00587795
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DOI: https://doi.org/10.1007/BF00587795
Key-Words
- Biogenic Amines
- Cholinomimetic Substances
- Microelectrophoresis
- Colliculus Superior
- Mesencephalic Reticular Formation