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Evoked potentials induced by transcranial stimulation in dogs.
1990
Kraus K.H. | O'Brien D. | Pope E.R. | Kraus B.H.
Evoked potentials were induced by transcranial stimulation and recovered from the spinal cord, and the radial and sciatic nerves in six dogs. Stimulation was accomplished with an anode placed on the skin over the area of the motor cortex. Evoked potentials were recovered from the thoracic and lumbar spinal cord by electrodes placed transcutaneously in the ligamentum flavum. Evoked potentials were recovered from the radial and sciatic nerves by surgical exposure and electrodes placed in the perineurium. Signals from 100 repetitive stimuli were averaged and analyzed. Waveforms were analyzed for amplitude and latency. Conduction velocities were estimated from wave latencies and distance traveled. The technique allowed recovery of evoked potentials that had similar characteristics among all dogs. Conduction velocities of potentials recovered from the radial and sciatic nerves suggested stimulation of motor pathways; however, the exact origin and pathway of these waves is unknown.
Показать больше [+] Меньше [-]Culture of glial cells isolated from the spinal cord of demyelinating mice infected with Theiler's virus: An immunocytochemical study.
1991
Shin T.K.
Electron microscopic observations of the vascular endothelial cells in the central nervous system of piglets infected with porcine enterovirus serotype 3
1988
Shin, T.K. (Chungnam National Univ., Taejon (Korea R.). Coll. of Medicine) | Lee, C.S. (Kyongbuk National Univ., Taegu (Korea R.). Coll. of Veterinary Medicine)
In the course of studying porcine enterovirus infection in piglets, the vascular endothelial cells in the CNS of colostrum-deprived piglets with polioence-phalomyelitis were investigated by electron microscope. The experimental piglets were orally infected with the porcine enterovirus serogroup 3 isolated in Korea and necropsied at 7 days postinoculation. Crystalline arrays of viral particles were found in the vascular endothelial cells of the spinal cord and cerebellum. Aggregates of immature viral particles were occasionally observed in the vascular endothelial cells in the meninges. The rough ER was deprived of ribosomes, irregularly dilated and associated with viral crystals. There were abundant cytoplasmic filaments, dilatation of perivascular space, perivascular cuffing, and the partial disruptions of endothelial cell membrane and basal lamina
Показать больше [+] Меньше [-]Immunohistochemical evidence for immunoglobulin and complement deposition in spinal cord lesions in degenerative myelopathy in German Shepherd dogs
1994
Barclay, K.B. | Haines, D.M.
