The role of dorsal respiratory group neurons studied with cross-correlation in the decerebrate rat.

The role of dorsal respiratory group neurons studied with cross-correlation in the decerebrate rat. Research Abstract Details 

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The role of dorsal respiratory group neurons studied with cross-correlation in the decerebrate rat. Abstract Text:

G F Tian,J Duffin,

We examined the role of dorsal respiratory group (DRG) inspiratory neurons as transmitters of respiratory drive to phrenic and intercostal motoneurons and as relays of afferent information to ventral respiratory group (VRG) bulbospinal, inspiratory neurons. Attempts to antidromically activate 76 DRG neurons from the spinal cord at the C7 segment resulted in only 4 (5.3%) successes (3 contralateral, 1 ipsilateral). Cross-correlating DRG neuron discharge with that of the ipsilateral (56) and contralateral (20) phrenic nerve detected common activation peaks in 2 and 3 cases respectively, with no evidence for monosynaptic connections. Cross-correlating DRG neuron discharge with that of bulbospinal, inspiratory VRG neurons found some evidence for interaction. Peaks in 7 of 73 (10%) cross-correlation histograms were attributed to a monosynaptic excitation of DRG neurons by VRG neurons, although a common activation cannot be ruled out; troughs, some with an accompanying peak, in 9 (12.3%) histograms were interpreted as a combined excitation of the DRG neuron and delayed inhibition of the VRG neuron. In addition, 2 cross-correlation histograms showed peaks with latencies and half-amplitude widths consistent with a disynaptic excitation of a DRG neuron by a bulbospinal inspiratory VRG neuron. Cross-correlating the discharge of 57 pairs of DRG inspiratory neurons (6 contralateral) detected common activation peaks in 7 (12.3%) cases (none contralateral) and one case interpreted as evidence for a disynaptic excitation. These findings suggest that the role of the DRG inspiratory neurons in rats differs from that in cats, primarily because they do not act to transmit respiratory rhythmic drive directly to phrenic and intercostal motoneurons. The results offer some support for an excitation of DRG neurons by VRG inspiratory neurons, but no support for a role of DRG inspiratory neurons as mediators of afferent information transfer to VRG bulbospinal inspiratory neurons.

The role of dorsal respiratory group neurons studied with cross-correlation in the decerebrate rat. Publishing Authors By Initials

GF Tian,J Duffin,

For similar respiratory system research abstracts see: respiratory system research

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The role of dorsal respiratory group neurons studied with cross-correlation in the decerebrate rat. Journal Published:

PUBLICATION TYPE: Research Support, Non-U.S. Gov

Journal: Experimental brain research. Experimentelle Hirnfo

VOLUME: 121

Page Numbers: 29-34

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ISSN: 0014-4819

DAY: 15

MONTH: Jul

YEAR: 1998

The role of dorsal respiratory group neurons studied with cross-correlation in the decerebrate rat. Information

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LANGUAGE: eng

NlmUniqueID: 43312

The role of dorsal respiratory group neurons studied with cross-correlation in the decerebrate rat. Keywords Mesh Terms:

KEYWORDS: Respiratory System

MESH TERMS: innervation

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Grant and Affiliation Information for The role of dorsal respiratory group neurons studied with cross-correlation in the decerebrate rat.

AFFILIATION: Department of Physiology, University of Toronto, Ontario, Canada.

Country: GERMANY

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MEDLINETA: Exp Brain Res

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