Summary
The high tonic discharge rates of globus pallidus neurons in awake monkeys suggest that these neurons may receive some potent excitatory input. Because most current electrophysiological evidence suggests that the major described pallidal afferent systems from the neostriatum are primarily inhibitory, we used retrograde transport of horseradish peroxidase (HRP) to identify possible additional sources of pallidal afferent fibers. The appropriate location was determined before HRP injection by mapping the characteristic high frequency discharge of single pallidal units in awake animals. In animals with injections confined to the internal pallidal segment, retrograde label was seen in neurons of the pedunculopontine nucleus, dorsal raphe nucleus, substantia nigra, caudate, putamen, subthalamic nucleus, parafascicular nucleus, zona incerta, medial and lateral subthalamic tegmentum, parabrachial nuclei, and locus coeruleus. An injection involving the external pallidal segment and the putamen as well resulted in additional labeling of cells in centromedian nucleus, pulvinar, and the ventromedial thalamus.
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Abbreviations
- AC:
-
anterior commissure
- CG:
-
central grey
- CM:
-
centromedian nucleus
- CN:
-
caudate nucleus
- DM:
-
dorsomedial nucleus
- DR:
-
dorsal raphe nucleus
- DSCP:
-
decussation of superior cerebellar peduncle
- GPe:
-
globus pallidus, external segment
- GPi:
-
globus pallidus, internal segment
- LC:
-
locus coeruleus
- LL:
-
lateral lemniscus
- MG:
-
medial geniculate nucleus
- ML:
-
medial lemniscus
- NVI:
-
abducens nucleus
- OT:
-
optic tract
- Pbl:
-
lateral parabrachial nucleus
- Pbm:
-
medial parabrachial nucleus
- Pf:
-
parafascicular nucleus
- PPN:
-
pedunculopontine nucleus
- PuO:
-
oral pulvinar nucleus
- RN:
-
red nucleus
- SCP:
-
superior cerebellar peduncle
- SI:
-
substantia innominata
- SNc:
-
substantia nigra, pars compacta
- SNr:
-
substantia nigra, pars reticulata
- STN:
-
subthalamic nucleus
- TMT:
-
mamillothalamic tract
- VA:
-
ventral anterior nucleus
- VLc:
-
ventral lateral nucleus, pars caudalis
- VLm:
-
ventral lateral nucleus, pars medialis
- VLo:
-
ventral lateral nucleus, pars oralis
- VPI:
-
ventral posterior inferior nucleus
- VPM:
-
ventral posterior medial nucleus
- VPLc:
-
ventral posterior lateral nucleus, pars caudalis
- ZI:
-
zona incerta
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DeVito, J.L., Anderson, M.E. & Walsh, K.E. A horseradish peroxidase study of afferent connections of the globus pallidus in Macaca mulatta. Exp Brain Res 38, 65–73 (1980). https://doi.org/10.1007/BF00237932
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DOI: https://doi.org/10.1007/BF00237932