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Spontaneous activity has been demonstrated in the lumbar dorsal roots of isolated spinal cord preparations taken from animals ranging in age from 2 to 65 days. Peaks of activity were recorded at 2 and 5 weeks of age, with mean firing frequencies of 33 Hz and 28 Hz respectively. The firing frequency in weeks 3 and 4 was lower (15 Hz) as was the frequency in… (More)
Bath applied delta-aminolaevulinic acid (ALA, 1-1000 microM), significantly depressed the frequency of spontaneous antidromic activity in the lumbar dorsal roots, and the amplitude of the monosynaptic component of the dorsal root-evoked ventral root reflex, in isolated rat spinal cord in a concentration-related manner. In contrast bath concentrations up to… (More)
The frequency of spontaneous activity recorded from lumbar dorsal roots and the lumbar dorsal horn of isolated spinal cord preparations taken from hamsters aged between 2 days to 8 weeks showed an age dependent sensitivity to 1 mM Mg2+ and 5 microM AP5. Spontaneous dorsal root and dorsal horn activity in cords from animals less than 3 weeks of age was… (More)