In the present study the efferent connections of the ectostriatal core were investigated with biotinylated dextran-amine anterograde tracer in the chicken using light microscopy. The efferents of the ectostriatal core were labelled anterogradely, but retrograde labelling was also observed, which displayed the afferents of the same region. The ectostriatal belt received a few thin varicose fibres; retrogradely labelled cells also appeared. The most extended projection ended in the surrounding neostriatum, which turned out to be reciprocally connected to the ectostriatal core. On the basis of these connections, the neostriatum is said to be an important visual associative center. Efferent fibres reached the motor areas as well. A significant projection entered the paleostriatum augmentatum, especially the ventral part. The paleostriatum primitivum also received a few fibres. The other motor center, the medial part of the anterior archistriatum, was proved to be directly connected to the ectostriatal core as well. Considering that the archistriatum is also connected indirectly to the Wulst, the movements are able to be guided by well processed visual information.
ASJC Scopus subject areas
- Developmental Biology