Cortical control of trigeminal motoneurons in the rat

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Abstract 1. 1. Cortical influence on excitation of mylohyoid (Myl) and masseteric (Mass) nerves (Nn) and their motoneurons was studied in the rat. 2. 2. The frontal cortex excited a majority of the contralateral mylohyoid-digastric (c Myl-Dig) motoneurons, about a half of the ipsilateral (i) Myl-Dig motoneurons, about a third of c Mass motoneurons and the fewest i Mass motoneurons. 3. 3. A small number of c Mass motoneurons was considered to receive inhibitory influence since cortical stimulation inhibited antidromic activity and some of orthodromic activity. 4. 4. Stimulation of these motoneuron pool induced antidromic activity in the frontal cortex and a monosynaptic pathway is possible in the cortico-c Myl-Dig excitatory projection.

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