Electromyographic Analysis of the Circumoral Muscles of Facial Expression

Abstract

Electromyography of the circumoral muscles was undertaken with the use of fine-wire electrodes that were inserted into of hair follicles of ten patients with full dentitions and normal occlusion. The inferior circumoral muscles, which initiated many oral activities, had a higher degree of activity than did the superior circumoral muscles. Tonic discharge during mandibular rest was infrequent.

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