Topographic arrangement of the projection from the anterior thalamic nuclei to the cingulate cortex in the cat.

After injection of HRP into the cingulate and its adjacent cortical areas, neuronal cells were retrogradely labeled ipsilaterally in the anterior, lateral, ventral, intralaminar and midline thalamic nuclei. Most of them occurred in the anterior nuclei, and a topographic correlation was revealed in the projections from the anterior thalamic nuclei to the cingulate gyrus: the rostral part of the cingulate gyrus receives fibers predominantly from the lateral part of the AM and additionally from the caudomedial part of the AV. The caudal part of the cingulate gyrus receives fibers from the medial part of the anteromedial nucleus (AM) and the rostromedial part of the anteroventral nucleus (AV). The intermediate part of the cingulate gyrus receives fibers from the intermediate part of the AM and the caudal half of the AV.