抄録
(1) The discharge patterns during strychnine tetanus of the spinal frog were investigated for the purpose of analysing the origin of rhythmic activity.
(2) Normal discharge pattern was initially a continuous type of enormous irregular impulses, which later turned into a periodic type of grouped impulses with regular rhythm.
(3) The regular discharge patterns recorded simultaneously from two differ-ent points in the spinal cord or two different muscles showed that the impulses in both records did not begin to fire at the same time, but they ceased to fire at the same instant in all of two corresponding groups of impulses.
(4) The tetanic impulses never spread electrotonically through the tran-section of spinal cord from one side to the other.
(5) There was no tendency to make rhythm in the part of spinal cord above 3rd intervertebra or below 5th intervertebra.
(6) Afferent impulses through skin nerve could reset or inhibit the rhythm.
(7) The possibility of the circuit movement, involving the inhibitory inter-neuron with many collaterals for motoneurons was discussed as the origin of autorhythmicity.
