Locus coeruleus modulation of the motor thalamus

Inhibition in nuclei ventralis lateralis and ventralis anterior

Michael Rivner, Jerome Sutin

Research output: Contribution to journalArticle

16 Citations (Scopus)

Abstract

Single-cell recordings were made from 693 cells in thalamic nuclei ventralis lateralis and ventralis anterior (VL-VA). Cells were identified as thalamocortical projection cells by antidromic firing from motor cortex or classified according to responsiveness to stimulation of the brachium conjunctivum (BC), entopeduncular nucleus, and motor cortx. Only 14% of the cells tested responded to entopeduncular nucleus stimulation, whereas BC and motor cortex (orthodromic) stimulation each evoked responses in 31% of the VL-VA cells tested. The most common sources of convergent input to VL-VA cells were motor cortex and BC. In 30% of the VL-VA population tested, spontaneous firing was inhibited by stimulation of the locus coeruleus (LC). This inhibition had a long latency to onset which varied from cell to cell (100 to 1000 ms or more) and a long duration (mean = 1183 ms). The inhibition of spontaneous firing by LC was associated with a variable effect upon BC-evoked excitatory responses in VL-VA cells. In some cases, BC evoked responses were suppressed, but not abolished. In other cells, the excitatory response to BC was unaffected despite complete cessation of VL-VA cell spontaneous firing after LC stimulation. The inhibitory action of LC was not limited to any class of VL-VA cells, but occurred most frequently in neurons receiving an input from the BC. The LC inhibition of VL-VA is not related to changes in systemic blood pressure or an action at the level of the cerebellar cortex. However, LC also produces inhibitory and excitatory effects in centrum medianum neurons, which could account for some of the long-latency responses observed in VL-VA. This electrophysiological study of the action of locus coeruleus upon cellular activity in the motor thalamus argues against involvement in phasic movement and associated postural adjustments. Rather, the locus coeruleus projection to thalamus has properties which suggest a role in longer-term tonic regulation of motor activity.

Original languageEnglish (US)
Pages (from-to)651-673
Number of pages23
JournalExperimental Neurology
Volume73
Issue number3
DOIs
StatePublished - Jan 1 1981

Fingerprint

Ventral Thalamic Nuclei
Locus Coeruleus
Thalamus
Arm
Motor Cortex
Entopeduncular Nucleus
Motor Activity
Intralaminar Thalamic Nuclei
Social Adjustment
Neurons
Thalamic Nuclei
Cerebellar Cortex
Reaction Time

ASJC Scopus subject areas

  • Neurology
  • Developmental Neuroscience

Cite this

Locus coeruleus modulation of the motor thalamus : Inhibition in nuclei ventralis lateralis and ventralis anterior. / Rivner, Michael; Sutin, Jerome.

In: Experimental Neurology, Vol. 73, No. 3, 01.01.1981, p. 651-673.

Research output: Contribution to journalArticle

@article{7aca8eddeb764368b445c1c9daefa8e6,
title = "Locus coeruleus modulation of the motor thalamus: Inhibition in nuclei ventralis lateralis and ventralis anterior",
abstract = "Single-cell recordings were made from 693 cells in thalamic nuclei ventralis lateralis and ventralis anterior (VL-VA). Cells were identified as thalamocortical projection cells by antidromic firing from motor cortex or classified according to responsiveness to stimulation of the brachium conjunctivum (BC), entopeduncular nucleus, and motor cortx. Only 14{\%} of the cells tested responded to entopeduncular nucleus stimulation, whereas BC and motor cortex (orthodromic) stimulation each evoked responses in 31{\%} of the VL-VA cells tested. The most common sources of convergent input to VL-VA cells were motor cortex and BC. In 30{\%} of the VL-VA population tested, spontaneous firing was inhibited by stimulation of the locus coeruleus (LC). This inhibition had a long latency to onset which varied from cell to cell (100 to 1000 ms or more) and a long duration (mean = 1183 ms). The inhibition of spontaneous firing by LC was associated with a variable effect upon BC-evoked excitatory responses in VL-VA cells. In some cases, BC evoked responses were suppressed, but not abolished. In other cells, the excitatory response to BC was unaffected despite complete cessation of VL-VA cell spontaneous firing after LC stimulation. The inhibitory action of LC was not limited to any class of VL-VA cells, but occurred most frequently in neurons receiving an input from the BC. The LC inhibition of VL-VA is not related to changes in systemic blood pressure or an action at the level of the cerebellar cortex. However, LC also produces inhibitory and excitatory effects in centrum medianum neurons, which could account for some of the long-latency responses observed in VL-VA. This electrophysiological study of the action of locus coeruleus upon cellular activity in the motor thalamus argues against involvement in phasic movement and associated postural adjustments. Rather, the locus coeruleus projection to thalamus has properties which suggest a role in longer-term tonic regulation of motor activity.",
author = "Michael Rivner and Jerome Sutin",
year = "1981",
month = "1",
day = "1",
doi = "10.1016/0014-4886(81)90203-X",
language = "English (US)",
volume = "73",
pages = "651--673",
journal = "Experimental Neurology",
issn = "0014-4886",
publisher = "Academic Press Inc.",
number = "3",

}

TY - JOUR

T1 - Locus coeruleus modulation of the motor thalamus

T2 - Inhibition in nuclei ventralis lateralis and ventralis anterior

AU - Rivner, Michael

AU - Sutin, Jerome

PY - 1981/1/1

Y1 - 1981/1/1

N2 - Single-cell recordings were made from 693 cells in thalamic nuclei ventralis lateralis and ventralis anterior (VL-VA). Cells were identified as thalamocortical projection cells by antidromic firing from motor cortex or classified according to responsiveness to stimulation of the brachium conjunctivum (BC), entopeduncular nucleus, and motor cortx. Only 14% of the cells tested responded to entopeduncular nucleus stimulation, whereas BC and motor cortex (orthodromic) stimulation each evoked responses in 31% of the VL-VA cells tested. The most common sources of convergent input to VL-VA cells were motor cortex and BC. In 30% of the VL-VA population tested, spontaneous firing was inhibited by stimulation of the locus coeruleus (LC). This inhibition had a long latency to onset which varied from cell to cell (100 to 1000 ms or more) and a long duration (mean = 1183 ms). The inhibition of spontaneous firing by LC was associated with a variable effect upon BC-evoked excitatory responses in VL-VA cells. In some cases, BC evoked responses were suppressed, but not abolished. In other cells, the excitatory response to BC was unaffected despite complete cessation of VL-VA cell spontaneous firing after LC stimulation. The inhibitory action of LC was not limited to any class of VL-VA cells, but occurred most frequently in neurons receiving an input from the BC. The LC inhibition of VL-VA is not related to changes in systemic blood pressure or an action at the level of the cerebellar cortex. However, LC also produces inhibitory and excitatory effects in centrum medianum neurons, which could account for some of the long-latency responses observed in VL-VA. This electrophysiological study of the action of locus coeruleus upon cellular activity in the motor thalamus argues against involvement in phasic movement and associated postural adjustments. Rather, the locus coeruleus projection to thalamus has properties which suggest a role in longer-term tonic regulation of motor activity.

AB - Single-cell recordings were made from 693 cells in thalamic nuclei ventralis lateralis and ventralis anterior (VL-VA). Cells were identified as thalamocortical projection cells by antidromic firing from motor cortex or classified according to responsiveness to stimulation of the brachium conjunctivum (BC), entopeduncular nucleus, and motor cortx. Only 14% of the cells tested responded to entopeduncular nucleus stimulation, whereas BC and motor cortex (orthodromic) stimulation each evoked responses in 31% of the VL-VA cells tested. The most common sources of convergent input to VL-VA cells were motor cortex and BC. In 30% of the VL-VA population tested, spontaneous firing was inhibited by stimulation of the locus coeruleus (LC). This inhibition had a long latency to onset which varied from cell to cell (100 to 1000 ms or more) and a long duration (mean = 1183 ms). The inhibition of spontaneous firing by LC was associated with a variable effect upon BC-evoked excitatory responses in VL-VA cells. In some cases, BC evoked responses were suppressed, but not abolished. In other cells, the excitatory response to BC was unaffected despite complete cessation of VL-VA cell spontaneous firing after LC stimulation. The inhibitory action of LC was not limited to any class of VL-VA cells, but occurred most frequently in neurons receiving an input from the BC. The LC inhibition of VL-VA is not related to changes in systemic blood pressure or an action at the level of the cerebellar cortex. However, LC also produces inhibitory and excitatory effects in centrum medianum neurons, which could account for some of the long-latency responses observed in VL-VA. This electrophysiological study of the action of locus coeruleus upon cellular activity in the motor thalamus argues against involvement in phasic movement and associated postural adjustments. Rather, the locus coeruleus projection to thalamus has properties which suggest a role in longer-term tonic regulation of motor activity.

UR - http://www.scopus.com/inward/record.url?scp=0019440579&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0019440579&partnerID=8YFLogxK

U2 - 10.1016/0014-4886(81)90203-X

DO - 10.1016/0014-4886(81)90203-X

M3 - Article

VL - 73

SP - 651

EP - 673

JO - Experimental Neurology

JF - Experimental Neurology

SN - 0014-4886

IS - 3

ER -