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  • Book
    Section editor: A. G. Karczmar.
    Contents:

    v. 1. Muscarinic and nicotinic stimulant actions at autonomic ganglia, by R. L. Volle.
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    U323 .K18 1966
    1
  • Article
    Lumsden CE, Howard L, Aparicio SR.
    Brain Res. 1975 Aug 08;93(2):267-82.
    The potential evoked at the surface of the cerebral cortex of a guinea pig, by stimulation of the contralateral forepaw, usually consists of an initial double positive wave whose waveform remains unchanged during rapid stimulation. In a guinea pig with experimental allergic encephalomyelitis (EAE) the response is attenuated at low frequencies of stimulation. Observations were also made on animals with experimental allergic neuritis (AEN). These animals showed a peripheral specificity for decreased conduction velocity, but have normal cortical evoked responses. Histological studies were undertaken in parallel with the electrophysiological studies and the concordance and discordance between the two is discussed. We conclude that there is no evident correlation between the severity of the electrophysiological effects and the histological lesions. An attempt was also made to induce an immunological challenge in guinea pigs, in the same way that EAE and EAN is produced, by the injection of synaptosomes. No clinical signs or alterations in the histology or electrophysiology of the animals were seen. A discussion is included on the elucidation of the site of action of EAE by discriminating between the direct effects on myelin and synapses and by the indirect effects of myelin damage on synapses. No firm conclusion is reached and the matter is left for further analysis in the subsequent paper. Finally, the neurophysiological alterations, demonstrated in the EAE and EAN situations, are discussed in terms of a humoral factor possibly acting on the myelin sheath and indirectly affecting synaptic function. This matter is further discussed in the subsequent paper.
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