1991
DOI: 10.1007/bf00229826
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Differential control of short latency cutaneous excitation in cat FDL motoneurons during fictive locomotion

Abstract: Low threshold (less than or equal to 2 x T) cutaneous afferents in the superficial peroneal (SP) and medial plantar (PLNT) nerves both produce short-latency excitatory postsynaptic potentials (EPSPs) in flexor digitorum longus (FDL) alpha-motoneurons, with minimum central latencies (less than or equal to 1.8 ms) that indicate a disynaptic connection. However, SP and PLNT EPSPs in FDL motoneurons are differentially modulated during fictive stepping in decerebrate cats. The early components in SP EPSPs are syste… Show more

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Cited by 48 publications
(60 citation statements)
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“…The well-documented decrease in SP-evoked EPSP latency during locomotion in FDL motoneurons has been attributed to increased interneuronal excitability (Burke 1999;Burke et al 2001;Moschovakis et al 1991;Schmidt et al 1988). Reduced latencies of some SP-evoked EPSPs were also seen in this study (e.g., Fig.…”
Section: Central Latencies Of the Sp-evoked Synaptic Responsessupporting
confidence: 78%
“…The well-documented decrease in SP-evoked EPSP latency during locomotion in FDL motoneurons has been attributed to increased interneuronal excitability (Burke 1999;Burke et al 2001;Moschovakis et al 1991;Schmidt et al 1988). Reduced latencies of some SP-evoked EPSPs were also seen in this study (e.g., Fig.…”
Section: Central Latencies Of the Sp-evoked Synaptic Responsessupporting
confidence: 78%
“…It is not known whether longer periods of step training or a larger sample would have revealed changes in additional pathways. Nervespecific reflex responses to cutaneous stimulation were previously observed during locomotion in cats (Abraham et al, 1985;Moschovakis et al, 1991;Pratt et al, 1991;LaBella et al, 1992;Degtyarenko et al, 1996) and humans (van Wezel et al, 1997) to provide location-specific information from the skin of the foot. However, a common synergy of flexor responses in the swing phase and of extensor responses in the stance phase was also observed, independent of the location of the stimulus in cats walking on a treadmill (Duysens and Stein, 1978;Duysens and Loeb, 1980;Abraham et al, 1985).…”
Section: Plasticity In Cutaneous Pathways Is Highly Specificmentioning
confidence: 90%
“…However, a significant change in transmission to FDL motoneurons was observed (all cutaneous nerves pooled together): going from type A to type D response (i.e., without inhibition, R2). FDL is a toe plantar flexor active just at the onset of swing (Fleshman et al, 1984;Schmidt et al, 1988;Moschovakis et al, 1991;Degtyarenko et al, 1996) to clear the toes from the ground (as St burst) (Rossignol, 1996). We suggest that inhibitory transmission to FDL is decreased in general to facilitate the excitatory effects of cutaneous signals related to paw drag during early training sessions.…”
Section: Possible Role Of Modified Cutaneous Transmissionmentioning
confidence: 99%
“…Similarly, a phase-dependent modulation and reversal of cutaneous reflexes is observed in spinal cats during fictive locomotion (Duysens et al, 1990;Schmidt et al, 1989;Moschovakis et al, 1991;Degtyarenko et al, 1996). Cutaneous afferents innervating the ankle and the foot-pad skin enhance and prolong stance and can increase the extensor burst by as much as 100% (Duysens and Pearson, 1976).…”
Section: Contribution Of Feedback From the Foot Sole And Hip To Spinamentioning
confidence: 86%