Abstract
The medial parabrachial nucleus (MPB) and external part of the medial parabrachial nucleus (MPBE) relay gustatory, oral mechanosensory and other visceral information in the rat brain and reportedly project not only to the parvicellular part of the posteromedial ventral thalamic nucleus (VPMpc) but also to the ventrocaudal part of the intralaminar thalamic nuclei. Generally, the intralaminar thalamic nuclei project topographically to the caudate putamen (CPu); however, it is unclear where the ventrocaudal part of the intralaminar thalamic nuclei projects within the CPu. Thus, we visualized neural pathways from the MPB and MPBE to the CPu via the ventrocaudal part of the intralaminar thalamic nuclei using an anterograde tracer, biotinylated dextran amine, and a retrograde tracer, cholera toxin B subunit. We found that the MPB and MPBE sent a relatively stronger input to the ventrocaudal part of the intralaminar thalamic nuclei such as the oval paracentral thalamic nucleus (OPC), central medial thalamic nucleus (CM) and parafascicular thalamic nucleus (PF) and retroreuniens area (RRe) as compared to the VPMpc. In turn, these thalamic nuclei projected to the ventral part of the CPu with the topographical arrangement as follows: the...Continue Reading
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