Monoamine containing neurons in the pigeon brain stem and their terminal fields in the telencephalon

Cellular localization of monoamines in the upper brain stem and distribution of their telencephalic terminal fields were studied in pigeons by fluorescence histochemistry. Two distinct cellular types were identified: one containing primary catecholamines (NE or DA), the other, 5-HT. In the telencephalon numerous DA axons were identified in the paleostriatum augmentatum and in the lobus paraolfactorius. The noradrenergic fibers were mainly concentrated in the Wulst regions which receive visual afferents from the dorsolateral thalamus.