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  • 1
    ISSN: 1432-1106
    Keywords: Parataenial nucleus ; Nucleus accumbens ; Autoradiography ; Thalamus ; Limbic system ; Rat
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary In this study the intrastriatal distribution of afferents arising from the parataenial nucleus of the thalamus was investigated. Tritiated leucine and proline injected into the parataenial nucleus was found to densely label the entire anterior-posterior extent of the medial nucleus accumbens. The projection was for the most part limited to this striatal subregion, although some moderate labelling was found along the medial wall of the anterior caudateputamen. The terminal labelling within accumbens was characterized by a distinct patchiness. Other efferent connections of the parataenial nucleus observed in this study include the thalamic reticular nucleus, the basolateral and central nuclei of the amygdala, the septum, the medial frontal cortex, the entorhinal cortex and subiculum. This projection is distributed to the “limbic afferented” sector of striatum, and there is a nearly complete overlap between the parataenial afferents and those coming from hippocampus. The present findings suggest that the parataenial nucleus is an important thalamic link between limbic and striatal processing.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1432-2072
    Keywords: Opiates ; Nucleus accumbens ; Supersensitivity ; Chronic neuroleptic ; 6-OHDA lesion ; Mesolimbic dopamine neurones ; Rat
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract In the present study the functional relationship between enkephalinergic and dopaminergic neurones at the level of the nucleus accumbens was investigated. The study consisted of two experiments in which dopaminergic (DA) transmission was chronically inhibited, and the behavioural locomotor response to intra-accumbens opiate injections analysed. First, specific 6-OHDA lesion of the DA-A10 neurones (either in nucleus accumbens or ventral tegmental area) was found markedly to increase the behavioural excitatory effects induced by nucleus accumbens injection of opioid peptides or morphine. Specific lesion of the central noradrenergic neurones had no such effect. Second, chronic pharmacological blockade of DA activity either with reserpine or a neuroleptic (pipothiazine palmitate) similarly induced a strong enhancement of the behavioral response to intra-accumbens opiate injection. The results are discussed in terms of novel mechanisms underlying denervation supersensitivity, and may have important implications for the relation between dopamine dysfunction in mental illness and opiate addiction.
    Type of Medium: Electronic Resource
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