Rhythmic activity of feline dorsal and ventral spinocerebellar tract neurons during fictive motor actions
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Rhythmic activity of feline dorsal and ventral spinocerebellar tract neurons during fictive motor actions. / Fedirchuk, Brent; Stecina, Katinka; Kristensen, Kasper Kyhl; Zhang, Mengliang; Meehan, Claire F; Bennett, David J; Hultborn, Hans.
In: Journal of Neurophysiology, Vol. 109, No. 2, 01.2013, p. 375-88.Research output: Contribution to journal › Journal article › Research › peer-review
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T1 - Rhythmic activity of feline dorsal and ventral spinocerebellar tract neurons during fictive motor actions
AU - Fedirchuk, Brent
AU - Stecina, Katinka
AU - Kristensen, Kasper Kyhl
AU - Zhang, Mengliang
AU - Meehan, Claire F
AU - Bennett, David J
AU - Hultborn, Hans
PY - 2013/1
Y1 - 2013/1
N2 - Neurons of the dorsal spinocerebellar tracts (DSCT) have been described to be rhythmically active during walking on a treadmill in decerebrate cats, but this activity ceased following deafferentation of the hindlimb. This observation supported the hypothesis that DSCT neurons primarily relay the activity of hindlimb afferents during locomotion, but lack input from the spinal central pattern generator. The ventral spinocerebellar tract (VSCT) neurons, on the other hand, were found to be active during actual locomotion (on a treadmill) even after deafferentation, as well as during fictive locomotion (without phasic afferent feedback). In this study, we compared the activity of DSCT and VSCT neurons during fictive rhythmic motor behaviors. We used decerebrate cat preparations in which fictive motor tasks can be evoked while the animal is paralyzed and there is no rhythmic sensory input from hindlimb nerves. Spinocerebellar tract cells with cell bodies located in the lumbar segments were identified by electrophysiological techniques and examined by extra- and intracellular microelectrode recordings. During fictive locomotion, 57/81 DSCT and 30/30 VSCT neurons showed phasic, cycle-related activity. During fictive scratch, 19/29 DSCT neurons showed activity related to the scratch cycle. We provide evidence for the first time that locomotor and scratch drive potentials are present not only in VSCT, but also in the majority of DSCT neurons. These results demonstrate that both spinocerebellar tracts receive input from the central pattern generator circuitry, often sufficient to elicit firing in the absence of sensory input.
AB - Neurons of the dorsal spinocerebellar tracts (DSCT) have been described to be rhythmically active during walking on a treadmill in decerebrate cats, but this activity ceased following deafferentation of the hindlimb. This observation supported the hypothesis that DSCT neurons primarily relay the activity of hindlimb afferents during locomotion, but lack input from the spinal central pattern generator. The ventral spinocerebellar tract (VSCT) neurons, on the other hand, were found to be active during actual locomotion (on a treadmill) even after deafferentation, as well as during fictive locomotion (without phasic afferent feedback). In this study, we compared the activity of DSCT and VSCT neurons during fictive rhythmic motor behaviors. We used decerebrate cat preparations in which fictive motor tasks can be evoked while the animal is paralyzed and there is no rhythmic sensory input from hindlimb nerves. Spinocerebellar tract cells with cell bodies located in the lumbar segments were identified by electrophysiological techniques and examined by extra- and intracellular microelectrode recordings. During fictive locomotion, 57/81 DSCT and 30/30 VSCT neurons showed phasic, cycle-related activity. During fictive scratch, 19/29 DSCT neurons showed activity related to the scratch cycle. We provide evidence for the first time that locomotor and scratch drive potentials are present not only in VSCT, but also in the majority of DSCT neurons. These results demonstrate that both spinocerebellar tracts receive input from the central pattern generator circuitry, often sufficient to elicit firing in the absence of sensory input.
KW - Action Potentials
KW - Animals
KW - Cats
KW - Decerebrate State
KW - Hindlimb
KW - Locomotion
KW - Neurons, Afferent
KW - Spinocerebellar Tracts
U2 - 10.1152/jn.00649.2012
DO - 10.1152/jn.00649.2012
M3 - Journal article
C2 - 23100134
VL - 109
SP - 375
EP - 388
JO - Journal of Neurophysiology
JF - Journal of Neurophysiology
SN - 0022-3077
IS - 2
ER -
ID: 120082251