The projection from striate and extrastriate cortical areas to the superior colliculus in the rat.

Following single injections of horseradish peroxidase (HRP) in the superior colliculus (SC) and [3H]proline in the striate cortex of rats, a close correspondence was observed in the topographical arrangements of extrastriate cortical fields of HRP retrograde label and of isotope anterograde label. These results support the notion that extrastriate cortex is divided into multiple physiologically and anatomically defined areas, and they suggest that these areas project separately to SC.