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Arborization patterns of amygdalopetal axons from the rat ventral pallidum
Umeå University, Faculty of Medicine, Department of Integrative Medical Biology (IMB). Center for Applied Medical Research (CIMA), Division of Neurosciences, Universidad de Navarra, Pamplona, Spain.
2016 (English)In: Brain Structure and Function, ISSN 1863-2653, E-ISSN 1863-2661, Vol. 221, no 9, 4549-4573 p.Article in journal (Refereed) Published
Abstract [en]

We previously analyzed the arborization patterns of rat ventral pallidal (VP) axons that coursed caudally to innervate the thalamus and brainstem (Tripathi et al. in Brain Struct Funct 218:1133-1157, 2013). Here, we have reconstructed 16 previously undetected axons from the same tracer deposits that follow a more lateral trajectory. Virtually all 16 axons emanating from the different VP compartments collateralized in the extended amygdala system (EAS) and amygdaloid complex. The most frequent targets of axons from the lateral and medial (VPm) VP compartments were the rostral sublenticular extended amygdala, the extended amygdala (EA), the central nucleus of the amygdala and the posterior part of the basolateral amygdaloid nucleus. In contrast, axons from the rostral extension of the VP preferentially innervated the anterior amygdaloid area, the magnocellular preoptic nucleus, and the anterior part of the basomedial amygdaloid nucleus. We additionally found and reconstructed a single corticopetal axon arising from the VPm. The new results show that both direct and indirect projections from the basolateral complex and EAS to the ventral striatopallidal system are reciprocated by VP projections, and suggest that the systems can be activated simultaneously. The results additionally suggest that the amygdaloid complex and cortex are innervated separately from the VP. Finally, the combination of new and previous data indicate that approximately 84 % of VP axons (88/105) participate in basal ganglia circuits, 15 % (16/105) target the amygdaloid complex, and less than 1 % innervate the cortex.

Place, publisher, year, edition, pages
2016. Vol. 221, no 9, 4549-4573 p.
Keyword [en]
Basal ganglia, Axonal collateralization, Basal forebrain, Corticopetal, Extended amygdala, Reward
National Category
Neurosciences
Identifiers
URN: urn:nbn:se:umu:diva-129685DOI: 10.1007/s00429-016-1184-2ISI: 000387657200017PubMedID: 26832919OAI: oai:DiVA.org:umu-129685DiVA: diva2:1064375
Available from: 2017-01-12 Created: 2017-01-09 Last updated: 2017-01-12Bibliographically approved

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CiteExportLink to record
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  • apa
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