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Two transpallidal pathways originating in the rat nucleus accumbens
1Department of Anatomy and Neurobiology St. Louis University School of Medicine, Missouri 63104.
The Journal of Comparative Neurology
|December 15, 1990
Summary
The nucleus accumbens projects differently to ventral pallidum subterritories. The shell targets the neurotensin-rich area, while the core targets the neurotensin-poor area, revealing specialized basal ganglia pathways.
Area of Science:
- Neuroscience
- Neuroanatomy
Background:
- The ventral pallidum (VP) is a key component of the basal ganglia.
- The VP comprises distinct subterritories with unique projection patterns.
- The nucleus accumbens (NAc) is a major input source to the VP.
Purpose of the Study:
- To investigate the projection patterns of the NAc to the subcommissural VP.
- To elucidate the neurochemical organization of NAc-VP pathways.
- To identify distinct functional subcircuits within the basal ganglia.
Main Methods:
- Anterograde transport of Phaseolus vulgaris leucoagglutinin (PHA-L) in rats.
- Peptide immunohistochemistry to identify neurochemical markers.
- Localization of PHA-L and peptide immunoreactivity in NAc and VP.
Main Results:
- The NAc shell selectively projects to the ventromedial VP, rich in neurotensin.
- The NAc core projects to the dorsolateral VP, lacking significant neurotensin.
- Topographic mapping revealed distinct termination patterns for NAc shell and core inputs.
Conclusions:
- The NAc-VP projection is topographically organized and neurochemically segregated.
- These findings suggest a specialized role for the NAc shell-VP pathway within the basal ganglia.
- Distinct subterritories of the VP may support specialized functions in motivated behaviors.