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Localization of biogenic amines and monoamine oxidase in the rabbit hippocampus

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Abstract

Comparison of the localization of monoamines and monoamine oxidase in the rabbit hippocampus shows that most pyramidal and all granular neurons contain no monoamines. Up to 1% of pyramidal and about 3% of polymorphic neurons are noradrenergic, and some of the latter are basket cells. Their terminals, containing both noradrenalin and monoamine oxidase, are in contact with the bodies and processes of the pyramidal and granular neurons. Single serotoninergic polymorphic neurons are found in sectors H1 and H2 of the cornu ammonis and in sector H5 of the fascia dentata of the hippocampus; they have few terminals. Noradrenergic afferents enter the cornu ammonis in the external bundle of the alveus and in the septal tract, which runs along the inner surface of the fimbria. Noradrenergic terminal plexuses surround the bodies of the pyramidal cells and are concentrated at the level of the apical dendrites of the pyramids and at the base of the granular neurons of the fascia dentata. Convergence of noradrenergic and serotoninergic terminals is found on some pyramidal, granular, and polymorphic neurons. The high concentration of serotonin in the hippocampus despite the minimal number of serotoninergic neurons can be explained by the large number of serotonin-containing stellate cells of nonneural nature. They are localized on groups of pyramidal neurons in sectors H1 and H2 and also on blood vessels. Individual variations are found in the number of serotonin-containing neurons in the hippocampus and in the number and distribution of serotonin-containing stellate cells.

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Additional information

A. A. Bogomolets' Institute of Physiology, Academy of Sciences of the Ukrainian SSR, Kiev. Translated from Neirofiziologiya, Vol. 5, No. 1, pp. 40–46, January–February, 1973.

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Torskaya, I.V., Burchinskaya, L.F. & Korotchenko, V.V. Localization of biogenic amines and monoamine oxidase in the rabbit hippocampus. Neurophysiology 5, 30–36 (1973). https://doi.org/10.1007/BF01065209

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Keywords

  • Blood Vessel
  • Serotonin
  • Monoamine
  • Individual Variation
  • Pyramidal Neuron