Neuronal pathways for spinal reflexes activated by group I and group II muscle afferents in the spinal segment (Co1) innervating the tail in the low spinalized cat.

Neuronal pathways for spinal reflexes activated by group I and group II muscle afferents in the spinal segment (Co1) innervating the tail in the low spinalized cat. Research Abstract Details 

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Neuronal pathways for spinal reflexes activated by group I and group II muscle afferents in the spinal segment (Co1) innervating the tail in the low spinalized cat. Abstract Text:

N Wada,N Shikaki,

We studied neuronal pathways for spinal reflexes activated by group-I and group-II muscle afferents in the spinal segments innervating the tail in unanesthetized and spinalized (L1) cats. Experiments were performed on 25 adult cats of both sexes. The effects of stimulating nerves innervating six tail muscles on both sides were recorded from tail motoneurons in the first coccygeal spinal segment (Co1) using glass microelectrodes. Stable recordings were obtained from 150 tail motoneurons. Stimulation of group-1 muscle afferents (stimulus intensity <1.8 T) often produced EPSPs (82/150) after stimulating nerves innervating neighboring tail muscles. Motoneurons innervating the long-tendoned muscles, M. extensor caudae lateralis and M. flexor caudae longus (ECL and FCL), received heteronymous monosynaptic connections from group-I muscle afferents innervating the ipsilateral tail muscles. The motoneurons innervating segmental muscles, M. extensor caudae medialis and M. flexor caudae brevis (ECM and FCB), received heteronymous monosynaptic connections from group-I muscle afferents innervating tail muscles on both sides. The motoneurons innervating tail muscles originated from the Ossa coxae, M. abductor caudae externus and M. abductor caudae internus (ACE and ACI), received monosynaptic connection from group-I muscle afferents innervating most of the tail muscles on both sides. Crossed disynaptic inhibitory pathways activated by primary muscle afferent inputs were observed in ECM, ACE, FCL, and FCB motoneurons. The effects of group-II afferent inputs were not dependent on the kind of motoneuron, and alternative excitatory and inhibitory pathways were not clearly observed in the tail motoneuron pool. It is suggested that variability of the neuronal pathways from group-I and -II muscle afferents to tail motoneurons corresponds to functional relationships among tail muscles, depending on the tail movements.

Neuronal pathways for spinal reflexes activated by group I and group II muscle afferents in the spinal segment (Co1) innervating the tail in the low spinalized cat. Publishing Authors By Initials

N Wada,N Shikaki,

For similar animal structures: tail research abstracts see: animal structures: tail research

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Neuronal pathways for spinal reflexes activated by group I and group II muscle afferents in the spinal segment (Co1) innervating the tail in the low spinalized cat. Journal Published:

PUBLICATION TYPE: Journal Article

Journal: Experimental brain research. Experimentelle Hirnfo

VOLUME: 125

Page Numbers: 129-38

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ISSN: 0014-4819

DAY: 15

MONTH: Mar

YEAR: 1999

Neuronal pathways for spinal reflexes activated by group I and group II muscle afferents in the spinal segment (Co1) innervating the tail in the low spinalized cat. Information

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LANGUAGE: eng

NlmUniqueID: 43312

Neuronal pathways for spinal reflexes activated by group I and group II muscle afferents in the spinal segment (Co1) innervating the tail in the low spinalized cat. Keywords Mesh Terms:

KEYWORDS: Tail

MESH TERMS: innervation

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AFFILIATION: Department of Veterinary Physiology, Yamaguchi University, Japan. wada@agr.yamaguchi-u.ac.jp

Country: GERMANY

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MEDLINETA: Exp Brain Res

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Neuronal pathways for spinal reflexes activated by group I and group II muscle afferents in the spinal segment Co1 innervating the tail in the low spinalized cat Related Publications

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