Intersegmental and intrasegmental distribution of mutual inhibition of Renshaw cells.

Ryall, R. W.; Piercey, Montford F.; Polosa, C.

doi:10.1152/jn.1971.34.4.700

Cited by 56 publications

(26 citation statements)

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“…However, the study of the Scheibels was performed on immature kittens in contrast to the present study on adult animals. Our findings indicate that the post-synaptic neurones should be located rather close to the presynaptic ones and that intersegmental effects of the a-motor axon collaterals (Renshaw, 1941;Wilson et al 1960;Eccles et al 1961;Hultborn et al 1971b;Ryall, Piercey & Polosa, 1971) should not contain any major monosynaptic components.…”

Section: S Cullheim and J-o Kellerthmentioning

confidence: 58%

A morphological study of the axons and recurrent axon collaterals of cat alpha‐motoneurones supplying different hind‐limb muscles.

Cullheim¹,

Kellerth²

1978

The Journal of Physiology

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SUMMARY1. Intracellular injections with horseradish peroxidase were performed in cat a-motoneurones supplying various hind-limb muscles.2. Ten a-motoneurones from each of the quadriceps, posterior biceps, gastroenemius-soleus and anterior tibial pools as well as from the pool supplying the short plantar muscles were collected for morphological analysis of the intramedullary axonal systems including the recurrent axon collaterals.3. The diameter of the a-motor axons showed considerable variation within each motoneurone pool, the total range being from 4 6 to 9 0 ,tm. No significant difference in mean axon diameter was obtained between the different pools.4. All a-motoneurones supplying the short plantar muscles and one single amotoneurone supplying the quadriceps muscle lacked collaterals completely, while the remaining motoneurones gave off one to five collaterals.5. The number of axon collateral outbulgings, interpreted as synaptic boutons, which originated from a single a-motoneurone showed large variation within each pool that possessed axon collaterals, the total range being from seventeen to 158. The mean number varied from forty-four (quadriceps) to eighty-two (anterior tibial).6. The axon collateral outbulgings were distributed not only in the Renshaw cell area ventromedial to the main motor nuclei but also in those parts of the motor nuclei which were located in the vicinity of the parent cell bodies. In the rostrocaudal direction, the outbulgings were distributed within a distance of less than 1 mm around the position of the parent cell bodies.7. Some physiological implications of the lack of axon collaterals from a-motoneurones supplying the short plantar muscles were discussed in relation to the functional characteristics of plantar muscles and motor units.

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Section: S Cullheim and J-o Kellerthmentioning

confidence: 58%

A morphological study of the axons and recurrent axon collaterals of cat alpha‐motoneurones supplying different hind‐limb muscles.

Cullheim¹,

Kellerth²

1978

The Journal of Physiology

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“…Interconnections among INs and AMNs are responsible for many of the integrative functions of the spinal cord. Most of the signals from the spinal nerves or signals from the brain are transmitted fi rst through INs, and then reach the AMNs [19,20].…”

Section: Basic Morphophysiolology Of the Spinal Reflexmentioning

confidence: 99%

Computer modeling of a spinal reflex circuit

Dalcin

Cruz²,

Cortez³

et al. 2005

Braz. J. Phys.

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We used a set of properties of the interactions among the spinal neurons in order to develop a computer model for a spinal reflex circuit. The model equations take into account the synaptic characteristics of the somatodendritic membrane of neurons in a morphofunctional unity of the spinal reflex activity. This model is based on the idea that the responses of spinal alpha-motoneurons to a sensorial stimulation can be modulated by the serial activation of a motor command chain. We developed a Fortran program for simulating a physiological situation. The results are discussed in terms of available experimental data for the motoneuron fi ring rate.

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“…Mutual inhibition may follow the excitation evoked by stimulation ofa single motor nerve (Ryall, 1970;Ryall et al 1971). The significance of mutual inhibition within a particular motor nucleus is unknown but may be quite different from the proposed significance of mutual inhibition between different motor nuclei.…”

Section: A)mentioning

confidence: 99%

“…Renshaw cells mutually inhibit each other (Ryall, 1970;Ryall, Piercey & Polosa, 1971), besides inhibiting various other spinal neurones, including motoneurones (Renshaw, 1946;Eccles et al 1956; Eccles, Eccles, Iggo & Ito, 1961 a) and group Ia interneurones presumed to mediate reciprocal inhibition (Hultborn, Jankowska & Lindstrom, 1971a;Belcher, Davies & Ryall, 1976).…”

Section: Introductionmentioning

confidence: 99%

Patterns of recurrent excitation and mutual inhibition of cat Renshaw cells.

Ryall¹

1981

The Journal of Physiology

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SUMMARY1. Patterns of convergent excitation and mutual inhibition of Renshaw cells to antidromic volleys in motor axons were investigated in cats anaesthetized with chloralose.2. There were widely varying patterns of excitatory convergence onto individual Renshaw cells, but grouping the cells into different populations revealed the underlying positive and negative correlations between inputs from different motor nerves.3. The greatest excitatory convergence was seen between axons supplying functionally synergistic muscles.4. Mutual inhibition between Renshaw cell populations was most evident between antagonist motoneurones and so was inversely related to the excitatory inputs.5. These results are discussed in relation to the control of recurrent inhibitory phenomena mediated by Renshaw cells.

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Intersegmental and intrasegmental distribution of mutual inhibition of Renshaw cells.

Cited by 56 publications

References 0 publications

A morphological study of the axons and recurrent axon collaterals of cat alpha‐motoneurones supplying different hind‐limb muscles.

A morphological study of the axons and recurrent axon collaterals of cat alpha‐motoneurones supplying different hind‐limb muscles.

Computer modeling of a spinal reflex circuit

Patterns of recurrent excitation and mutual inhibition of cat Renshaw cells.

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