FUNCTIONAL DIFFERENTIATION OF HYPOGLOSSAL NEURONS IN CATS

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  • 角 忠明
    Department of Physiology, Shinshu University Medical School

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In decerebrate and unanesthetized cats, changes in the intracellular potential of neurons in the hypoglossal nucleus following stimulation of the hypoglossal nerve were recorded.<BR>1. Of 158 cells examined, motoneurons (94.3%), interneurons (5.7%) were distinguished by hypoglossal nerve stimulation.<BR>2. Two groups of motoneurons responded differently in critical frequency for SD and/or IS blocking to the antidromic stimulation.<BR>3. Sizes of the motor axons were estimated from the conduction distance and latency of antidromic invasion to each motoneuron. The diameter distribution revealed gross unimodal configuration with the peak between 3 and 5μ.<BR>4. Some of the characters of the potential change in the “respiratory” hypoglossal motoneurons and slow fluctuations of various rhythm in others were reported.

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