Thalam-Cortical Organization of the Auditory System in the Cat

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The anterior and middle portions of the principal part of MGB have heavy projections to AT, including SF, and the adjoining portion of AII, which are organized topically in both anteroposterior and dorsoventral dimensions. It also projects fibers to the insular area in the anterior sylvian gyrus. The posterior portion of the principal part sends fibers massively to the dorsal portion of Ep and the most posterior part of AT. These projections appear to be organized in a topical manner anteroposteriorly and dorsoventrally. It gives off a fair number of fibers to limited caudal parts of the sylvian and posterior sylvian gyri. In addition, the principal part of MGB tends to project sporadic fibers diffusely to AT, AII, Ep, SF and the dorsal part of the insulo-temporal region. The magnocellular part of MGB sends marked projections to All and the adjoining parts of AT and of Ep in an orderly manner in the anteroposterior dimension. Its major portion, except for the caudal extremity, projects fibers to the insular area. The magnocellular part also tends to send scattered fibers to the cortex which covers SII, including the third auditory area (AIII), the face area of SI and most of the insulo-temporal area, in addition to the auditory cortex in the ectosylvian and sylvian gyri.
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