Abstract
Cortical projections to the inferior colliculus were studied in the cat by the Nauta and the Fink and Heimer degeneration techniques. The auditory cortex projects to all parts of the ipsilateral inferior colliculus, with the the terminations especially heavy in the external nucleus and the dorsomedial part of the central nucleus. Projections from the somesthetic, visual, and motor areas of the cortex terminate in various parts of the external nucleus and the medial part of the central nucleus. These connections are discussed as a possible inhibitory function to the inferior colliculus and thus influencing the ascending auditory system. The subdivisions of the inferior colliculus are also discussed.
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