Organization of the afferent connections of the mediodorsal thalamic nucleus in the rat, related to the mediodorsal-prefrontal topography

H J Groenewegen


The aim of the present study was to determine the organization of the afferents of the mediodorsal thalamic nucleus in relation to the reciprocal connections of this nucleus with different areas of the prefrontal cortex. For this purpose injections of horseradish peroxidase, or horseradish peroxidase conjugated to wheatgerm agglutinin were placed in different parts of the mediodorsal nucleus. These experiments revealed the organization of the reciprocal mediodorsal-prefrontal connections since wheatgerm agglutinin-horseradish peroxidase is transported effectively in anterograde and retrograde directions. Injections of wheatgerm agglutinin-horseradish peroxidase or fluorescent tracers were placed in different portions of the prefrontal cortex, and the lectin Phaseolus vulgaris leucoagglutinin was injected in the mediodorsal nucleus in order to verify in more detail the point-to-point relationship in the mediodorsal-prefrontal connections. The organization of a number of the subcortical afferents to the mediodorsal nucleus was determined in detail using injections of Phaseolus vulgaris leucoagglutinin, wheatgerm agglutinin-horseradish peroxidase, or tritiated amino acids in areas identified as a source of mediodorsal afferents in...Continue Reading


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