THE ROLE OF SPONTANEOUS FIRING OF THE TRIGEMINAL MOTONEURON

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  • KAWAMURA Yojiro
    Department of Oral-Physiology, Dental School, Osaka University
  • TAKATA Mitsuru
    Department of Oral-Physiology, Dental School, Osaka University
  • KATO Ichiro
    Department of Oral-Physiology, Dental School, Osaka University

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Abstract

1. In the trigeminal motor nucleus, the motoneuron responded to light pressure applied to a restricted site of the masseter muscle.<BR>2. The process of firing was differentiated into three phases. One was the phase with initial burst discharges at the onset of pressure application to the muscle, the second was the steady firing phase, and the third was the silent phase after removal of the pressure stimulus.<BR>3. The activity of a motoneuron was depressed by light pressure applied about 20mm anterior from the focus in the muscle. It is reasonable to suppose that a motoneuron shows a prominent increase in discharge if pressure is applied to an area comparable to that of the spindle capsule, and that this motoneuron stops discharging by the slack of the muscle spindle when pressure is applied to some area distant from the site of the spindle capsule.<BR>4. Time of recovery of motoneuron activity from both the excitation and the depression by pressure was completely proportional to the magnitude of applied pressure.<BR>5. The area of the muscle which could fire a motoneuron by pressure was mainly located on the anterior site of the masseter muscle.

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