the author examined electromyographic tracings from four muscles -- genioglossus ( gg ) , anterior belly of the digastric ( d ) sternothyroid ( st ) and thyrohyoid ( th ) -- for 210 twi syllables selected so as to give information on seven parameters : tense/lax vowels , long/short vowels , close/open vowels , front/back vowels , high-tone/low-tone vowels , vowels preceded by a fricative/plosive consonant and vowels preceded by a voiced/voiceless consonant , and concluded , inter alia ( 1 ) that gg and d functioned as pitch control muscles but that it is not clear why raising of the larynx should accompany an increase in pitch ;
C0224167
thyrohyoid
C0023078
larynx