カエルにおける脊髄反射の遠心性放電
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概要
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1. Action potential wave shapes in the afferent and efferent nerves innervating the hind-limbs of the bull-frog, Rana catesbiana and the features of its spinal reflex discharges were investigated. 2. Afferent action potentials were led from the spinal dorsal root in response to a single electrical shock applied to various peripheral nerve trunks. The wave shape of the compound afferent action potentials was roughly divided into four groups. The conduction velocity at 16.5℃ of each group is as follows: first group, 36.5m/sec; second group, 29.6m/sec; third group, 15.8m/sec; fourth group (irregular waves), 7.0-9.7m/sec. 3. The wave shape of efferent action potentials recorded from differnt peripheral nerves after stimulation of the spinal ventral root was roughly divided into two groups. The conduction velocities of two groups at 16℃ are 32.4m/sec and 15.7-20.0m/sec, respectively. The second group is, however, composed of small irregular waves. 4. When the spinal reflex discharge was recorded from the ipsilateral, peroneal and tibial nerve after application of single shock to the peroneal (or tibial) nerve, a train of large spike potentials (15-30msec in duration) appeared at first, and followed later a train of small spike potentials (continued over 400msec). Such reflex activity, however, did not appear in any of the contralateral peripheral nerves. 5. A similar spinal reflex discharge was evoked from both the peroneal and tibial nerve by single electrical stimulation of the cutaneous nerve. 6. The crossed reflex discharge was simultaneously evoked for the first time from both the peroneal and tibial nerve, by repetitive stimulation applied to the contralateral peroneal (or tibial) nerve. This response indicated a characteristic of the prolonged discharge and the long latent period over 300msec. 7. The reflex activity recorded from the spinal ventral root following a single shock to the peroneal (or tibial) nerve showed a similar pattern of discharges obtained in the peripheral motor nerve. Large and small spike potentials appeared, but they superimposed themselves on the ventral root potential. However, a small spike potential of the monosynaptic reflex discharge, which was not obtained by peripheral recording, was elicited at start of the rising phase of the slow potential. 8. However, monosynaptic response was not elicited by stimulation of the cutaneous nerve. It may be concluded that the afferent origin of the monosynaptic connexion exists in the muscle stretch receptor.
- 社団法人日本動物学会の論文
- 1962-05-15
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