Neuronal connections in the primary auditory cortex: An electrophysiological study in the cat

Neuronal connections in the primary auditory cortex (AI) of the cat were studied electrophysiologically by using intracellular recording techniques. Fast‐conducting fibers from the medial geniculate nucleus (MG) projected monosynaptically onto AI neurons in layers III–VI (mainly in layer IV), whereas slow‐conducting MG‐fibers projected monosynaptically onto AI neurons in layer I. AI neurons which received monosynaptic inputs from the auditory association cortices (AII and Ep) and/or from the contralateral AI were distributed in all layers of the AI; the commissural fibers from the contralateral AI were divided into fast‐ and slow‐conducting ones.

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