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The purpose of the present study is to demonstrate that the many functional capabilities of the cricothyroid are a reflection of the existence of separate bellies within the muscle. Microdissection revealed three distinct muscle bellies within the cricothyroid: rectus, oblique, and horizontal. These differ in fiber orientation (rectus 79\u00b0, oblique 48\u00b0, horizontal 7\u00b0) and are separated by fascial planes. Histochemistry showed that these three bellies are composed of different percentages of slow twitch fibers (rectus 31.3%, oblique 43.3%, horizontal 39.6%). Finally, electromyography demonstrated differences in the electrical activity patterns of the three bellies. 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