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Electrophysiological and morphological characteristics of the medial geniculate body after removal of the auditory cortex in albino rats


Vestnik Leningradskogo Universiteta Biologiya (2): 69-76
Electrophysiological and morphological characteristics of the medial geniculate body after removal of the auditory cortex in albino rats
In intact rats and in different periods after ablation of the auditory cortex it was shown that in principal division dominant negative phase and in large-celled division of MGB positive phase were characteristic of summatory responses. Changes of auditory potentials were maximally seen in 2 weeks after the ablation. In one month after the lesion the shape and amplitude of evoked potentials were partially or completed restored. Changes of auditory potentials were greater in the principal than in large-celled division of MGB. In 2 weeks after the ablation some neurons in principal division undergo complete degeneration, whereas the structure of the other cells has changed. In 1-2 months after the lesion retrograde degeneration occurs more clearly in principal division. Thus, in its ventral portion nearly all cells are completely degenerated. However, in large-celled division there is no increase of degenerative changes within this period.


Accession: 005349443



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