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Model of layer 5 and layer 6 input to the IC. Pyramidal cells in layer 5 receive direct input from the MGB and send large projections to the nonlemniscal portions of the IC. Nonprimary regions of the AC and nonauditory regions housing layer 6 corticocollicular neurons receive input from nonauditory regions of the thalamus and amygdala. Layer 6 corticocollicular cells then send projections ending in small terminals on the outer rim of the nonlemniscal portions of the IC.
