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Previous Article | Next Article
Volume 16, Number 18, Issue of September 15, 1996 pp. 5777-5794
Copyright ©1996 Society for NeuroscienceDistribution of Networks Generating and Coordinating Locomotor Activity in the Neonatal Rat Spinal Cord In Vitro: A Lesion Study
Received Jan. 17, 1996; revised June 17, 1996; accepted June 20, 1996.
Ole Kjaerulff and Ole Kiehn Division of Neurophysiology, Department of Medical Physiology, The Panum Institute, University of Copenhagen, DK-2200 Copenhagen, Denmark
The isolated spinal cord of the newborn rat contains networks that are able to create a patterned motor output resembling normal locomotor movements. In this study, we sought to localize the regions of primary importance for rhythm and pattern generation using specific mechanical lesions. We used ventral root recordings to monitor neuronal activity and tested the ability of various isolated parts of the caudal thoracic-lumbar cord to generate rhythmic bursting in a combination of 5-HT and NMDA. In addition, pathways mediating left/right and rostrocaudal burst alternation were localized. We found that the isolated ventral third of the spinal cord can generate normally coordinated rhythmic activity, whereas lateral fragments resulting from sagittal sections showed little or no rhythmogenic capability compared with intact control preparations. The ability to generate fast and regular rhythmic activity decreased in the caudal direction, but the rhythm-generating network was found to be distributed over the entire lumbar region and to extend into the caudal thoracic region. The pathways mediating left/right alternation exist primarily in the ventral commissure. As with the rhythmogenic ability, these pathways were distributed along the lumbar enlargement. Both lateral and ventral funiculi were sufficient to coordinate activity in the rostral and caudal regions. We conclude that the networks organizing locomotor-related activity in the spinal cord of the newborn rat are distributed.
Key words: 5-HT; NMDA; neonatal rat; spinal cord; locomotion; central pattern generator
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[Abstract] [Full Text] [PDF]
M. Raastad, B. R. Johnson, and O. Kiehn
Analysis of EPSCs and IPSCs Carrying Rhythmic, Locomotor-Related Information in the Isolated Spinal Cord of the Neonatal Rat
J Neurophysiol, October 1, 1997; 78(4): 1851 - 1859.
[Abstract] [Full Text] [PDF]
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