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Descending influence of auditory cortex behind rhinal sulcus (acbrs) on the electrical discharge of neurons in the medial geniculate body (mgb) of rabbits

Zhou Shaoci, Fend Maozi

Research Laboratory of Brain Function, Depzrtment of Biology, East China Normal Unioersiy. Shanghai, China

Abstract

The influence due to the stimulation of the auditory cortex on the response of the MGB units was investigated on 39 adult rabbits immobilized with Flaxedil. The stimulation of the Woolseys' A I ,A II or their surrounding temporal area and the stimulation of the ACBRS could inhibit the auditory response of partial MGB units, but a few units were faciliated during such cortical stimulation. The stimulated temporal cortical points,which gave such inhibitory and facilitatory effects, had a considerably wide distribution, whereas the stimulated ACBRS points, which had similar effects, concentrated in a relatively limited region. Since the latent period of inhibitory effect caused by ACBRS stimulation on the activity of MGB unit was about 1-2 ms, and since this stimulation could inhibit both the early and the late responses of MGB unit with the same latent period, the authors are of the opinion that the descending influence produced by ACBRS stimulation takes place within the MGB nucleus.

Key words: Temporal cortex;Medial geniculate body;Auditory cortex behind rhinal sulcus;Descending influence of auditory cortex;Inhibitory effect;Facilitatory effect

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Citing This Article：

Zhou Shaoci, Fend Maozi. Descending influence of auditory cortex behind rhinal sulcus (acbrs) on the electrical discharge of neurons in the medial geniculate body (mgb) of rabbits. Acta Physiol Sin 1985; 37 (3): (in Chinese with English abstract).