Echograms of the dorsal surface of the tongue in the midsagittal plane and in coronal oblique planes are presented. Comparisons are made among tongue height measurements obtained from the transverse and longitudinal echograms and from lateral head x rays. It is concluded that ultrasonic scanning can provide information on the shape of the dorsal surface of the tongue during sustained utterances and in the articulatory rest position.
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Minifie et al. (1971) studied this question.