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Internal musculature is the primary group of muscles involved in phonation by either abducting or adducting the vocal folds. The sole abductor of the group is the posterior cricoarytenoid. The muscles, lateral cricoarytenoid, thyroarytenoid, interarytenoid, and cricothyroid, all act together to adduct the vocal folds.
Vocal muscles are the muscles involved in producing sound through the voice. They include the muscles of the larynx (voice box), such as the thyroarytenoid muscles, cricothyroid muscles and vocalis muscles, as well as muscle in the throat, mouth and face that contribute to articulation and resonance. These muscles work together to control pitch, volume and tone, allowing us to speak.