Case pg221, fig6. Soma notes Three cases involve large multiple injections of HRP into auditory cortex. In one case the cortical injection site includes area 41 and extends into areas 20,36 and 39. Terminal notes In the ipsilateral inferior colliculus anterograde transport is observed from the caudal pole to more rostral regions. ?concentration of presumed terminal label in the DC. Robust caudally, heavy label along med./dor.med. portion. Light label throughout..

Case pg218, fig3. Soma notes DC injection yields heavy labeling in area 41 of ipsilateral cortex. about 2% of cortical population off labeled neurons are observed in contralateral area 41. Terminal notes 3 Injs of DC result in retrograde labelling of same structures. One inj into DC clearly covers first 2 laminae & apparently invades deep layer.