ON THE AUTOMATICITY OF THE RESPIRATORY CENTERS OF THE CATFISH AND CRUCIAN CARP

福原 武, 岡田 博匡

doi:10.2170/jjphysiol.6.313

By means of a microelectrode technique the experiments were performed to contribute to the solution of the question on the localization, as well as on the automaticity, of the respiratory centers in the catfish and the crucian carp. The results are summarized as follow:<BR>1) When at the region of the boundary of the acoustic tubercle and the facial lobe in the catfish, and at the region situated rostro-laterad to the lobus impar in the crucian carp, the microelectrode was inserted dorsoventrally half of the length of the dorso-ventral diameter of that region, the volleys consisting of spike discharges were detected recurrently with the rhythm of the movements of the gill covers.<BR>2) The histologic studies revealed that the tip of the electrode reached the region situated dorsad to the substantia gelatinosa Rolandi which was located dorsad to the motor trigeminal nucleus.<BR>3) In the brain stem which was isolated rostrad from the lobus opticus and caudad from the spinal cord, and in which all the brain nerves were cut, the volleys whose aspect was similar to that of the volleys observed before the isolation of the brain stem were detected from the region described in 2).<BR>4) From the results described above, it was concluded that the respiratory centers of the catfish, as well as those of the crucian carp, are most probably endowed with the ability to discharge with inherent rhythmicity.

ON THE AUTOMATICITY OF THE RESPIRATORY CENTERS OF THE CATFISH AND CRUCIAN CARP

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ON THE AUTOMATICITY OF THE RESPIRATORY CENTERS OF THE CATFISH AND CRUCIAN CARP

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