Cerebello- and pallido-thalamic pathways to areas 6 and 4 in the monkey.
Projections from the cerebellar nuclei (CN) and the internal segment of the globus pallidus (GPi) to areas 6 and 4 via the thalamus were examined electrophysiologically in monkeys. In addition to the well-known pallido-thalamo-cortical projection to area 6, some thalamic neurons with CN input were found to project to area 6. Seventeen neurons in VLc, area X and the dorsal margin of VPLo were activated antidromically by stimulation of supplementary motor or premotor areas, and orthodromically by CN stimulation. Twelve neurons in area X and the medial part of VPLo were found to receive CN input and to project to the arcuate premotor area (APA). Four neurons in the VLo-X border region which were identified to project to APA were inhibited by GPi stimulation.
Department of Physiology, Shiga University of Medical Sciences, Japan.
K
K
Jinnai
A
A
Nambu
I
I
Tanibuchi
S
S
Yoshida
D000818:Animals; D001111:Arcuate Nucleus of Hypothalamus / Q000502:physiology; D002531:Cerebellum / Q000502:physiology*; D004558:Electric Stimulation; D005071:Evoked Potentials / Q000502:physiology; D005917:Globus Pallidus / Q000502:physiology*; D008251:Macaca / Q000502:physiology*; D009044:Motor Cortex / Q000502:physiology*; D009434:Neural Pathways / Q000502:physiology; D009474:Neurons / Q000502:physiology; D013788:Thalamus / Q000166:cytology / Q000502:physiology*