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. 1992 Jan;445:345–354. doi: 10.1113/jphysiol.1992.sp018927

Depolarization of Ib afferent axons in the cat spinal cord during homonymous muscle contraction.

J Lafleur 1, D Zytnicki 1, G Horcholle-Bossavit 1, L Jami 1
PMCID: PMC1179985  PMID: 1501138

Abstract

1. Intra-axonal records from the intraspinal course of Ib and Ia afferent fibres innervating the gastrocnemius medialis muscle were obtained in chloralose or Nembutal-anaesthetized cats during submaximal contractions of the muscle. 2. Afferent fibres in continuity with their muscle of origin were functionally identified by their responses to muscle stretch or contraction. 3. In six out of eight Ib afferents, primary depolarizations (PADs) were recorded during contraction. They were independent of the presence of orthodromic impulses fired by tendon organs. 4. These observations support the assumption that the reduction of Ib autogenetic inhibition in homonymous and synergic motoneurones during GM contractions is due to presynaptic inhibition of transmission in Ib pathways.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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