Serial recording of reflexes after feline spinal cord transection |
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| Authors: | James W Little |
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| Institution: | 1. Spinal Cord Injury Service, Seattle V.A. Medical Center, University of Washington, Seattle, Washington 98105 USA;2. Department of Rehabilitation Medicine, University of Washington, Seattle, Washington 98105 USA;1. Department of Surgical Neuro-Oncology, National Institute of Neurology and Neurosurgery, South Insurgentes Avenue 3877, Tlalpan, 14269 Mexico City, Mexico;2. Department of Radiosurgery, National Institute of Neurology and Neurosurgery, South Insurgentes Avenue 3877, Tlalpan, 14269 Mexico City, Mexico;3. Department of Neurosurgery, National Institute of Neurology and Neurosurgery, South Insurgentes Avenue 3877, Tlalpan, 14269 Mexico City, Mexico;1. Servicio de Neurocirugía, Hospital Universitario de Burgos, Burgos, Spain;2. Servicio de Neurofisiología Clínica, Hospital Universitario de Burgos, Burgos, Spain;1. Department of Rehabilitation Medicine, University of Washington School of Medicine, Box 359740, Seattle, WA 98104-2499, USA;2. Section of Clinical Neurophysiology, Department of Neurosciences, King Faisal Specialist Hospital & Research Center, MBC 76, PO Box 3354, Riyadh, Saudi Arabia;3. Intraoperative Monitoring, Department of Neurophysiology, Abbott Northwestern Hospital, 800 E 28th Street, Minneapolis, MN 55407, USA;1. Department of Veterinary Clinical Pathology, School of Veterinary Medicine at the Federal University of Rio Grande do Sul, Porto Alegre, Brazil;2. Department of Microbiology, Immunology, and Parasitology, Institute of Basic Health Sciences, Federal University of Rio Grande do Sul, Porto Alegre, Brazil;3. Department of Animal Medicine, School of Veterinary Medicine, Federal University of Rio Grande do Sul, Porto Alegre, Brazil;4. Veterinary Private Practice, Porto Alegre, Brazil |
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| Abstract: | Implanted nerve cuff and muscle electrodes were used to serially record reflexes after spinal cord transection in cat. Recording of reflexes, in response to both sensory nerve and to mixed motor and sensory nerve stimulation, was accomplished through 2 months after cord section. Serial recording of afferent and efferent nerve volleys was achieved as well. Serial reflex changes that follow cord transection are described. Reflex amplitude to sensory nerve stimulation increased in two phases. The first increase was noted between 1 and 4 days after cord transection; the second increase was recorded between 2 and 4 weeks. These observations suggest that at least two neuronal mechanisms with distinct temporal courses mediate the appearance of spinal hyperreflexia. The animal model described may be useful for further study of the neuronal mechanisms which underlie the hyperreflexia of spinal cord injury. |
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