Abstract
In order to conduct the EMG activity of the human medial pterygoid muscle, a bipolar needle electrode (Thumbtack type) was newly devised and an aid (Needle indicator) to insertion of the electrode into the muscle was made.Then the activity of the medial pterygoid muscle during clenching was recorded by using them and investigated.The results were as follows:1. The bipolar needle electrode formed as a thumbtack was easy to handle and to insert into the medial pterygoid muscle.2. The apparatus, which could indicate the orientation of the medial pterygoid muscle on the mandibular angle, was very useful when inserting the electrode into the muscle.3. The original waves of EMG during tasks were clear and did not hinder the quantification of EMG.
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