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DRIVEN AND SPONTANEOUS ACTIVITIES OF SINGLE NEURON IN NUCLEUS CENTRUM MEDIANUM FOLLOWING STIMULATION OF PERIPHERAL NERVES Miyoshi URABE 1 , Takashi TSUBOKAWA 1 , You WATANABE 1 , Satoru KADOYA 1 1Dept. of Surgery, School of Med. Univ. of Kanazawa pp.25-37
Published Date 1966/1/1
DOI https://doi.org/10.11477/mf.1406201975
  • Abstract
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Exploring microelectrodically the convergent neurons in nucleus centrum medianum (CM) of the thalamus of unanesthetized cats, which responded to sciatic and splanchnic stimulations as well as noxious stimuli, the uthors investigated the natures of these CM neurons induring sensory perception. The results are summariz-ed as follows :

1) The frequency of spontaneous unitary discharges (SU) from CM was 5 to 27 per second and showed relatively regular pattern of discharge. These spontane ous unitary discharges (SU) were markedly reduced and became grouped pattern, under light anesthesia. Following cortical strychnization or stimulation of contralateral CM and mid-brain reticular formation (MRF), spontaneous unitary discharges (SU) exhibited marked facilitation.

2) Follwing splanchnic and sciatic nerve stimula-tions unitary discharges (SU) were recorded with the average latencies of 18.7 and 18.0 msec, respectively. Following the tetanic stimulation (10 cps) to both nerves, driven unitary discharges (DU) disappeared and spontaneous unitary discharges (SU) were facilitated.

3) The pattern of facilitation of spontaneous dis-charges (SU) following the tetanic stimulation of the splanchnic nerve was formulated as four groupes : type 1 showed the neurons in close relation with spindle burst (16%), type 2 showed the neurons with facilitation during and after the tetanic stimula-tion (45%), type 3 showed the neurons with facili-tation during the tetanic stimulation and inhibition in a phasic modus after the tetanic stimulation (25%), and type 4 showed the neurons with an inconstant facilitation (16%).

4) Eighty two neurons in CM which were endowed with a full condititon described above, had two or more receptive field on both sides to the noxious stimuli.

5) Reactability of CM-neurons to the noxious stimuli was demonstrated by an increase of frequency of discharge and a prolongation of duration of disc-harge.

6) Reactibility of CM neuron to the noxious stimuli was augmented by the stimulation of MRF or contralateral CM.


Copyright © 1966, Igaku-Shoin Ltd. All rights reserved.

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電子版ISSN 2185-405X 印刷版ISSN 0006-8969 医学書院

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