. Carnegie Institution of Washington publication. . Fig. 106—Method of vibration at the glottis. Fig. 107.—Glottal lips with medial loading. Fig. 108.—Glottal lips with lateral loading. separate action of the M. vocalis and the M. thyreoarytenoideus (externus). ^^Tlen the slant fibers which insert along the medial edge of the glottal lips (figure 109) are contracted, there will be nodal points similar to those of stretched strings. These differences produce differences in the forms of the puffs. We can thus explain the forms of puffs in the different types of vowels by differences in the actio
. Carnegie Institution of Washington publication. . Fig. 106—Method of vibration at the glottis. Fig. 107.—Glottal lips with medial loading. Fig. 108.—Glottal lips with lateral loading. separate action of the M. vocalis and the M. thyreoarytenoideus (externus). ^^Tlen the slant fibers which insert along the medial edge of the glottal lips (figure 109) are contracted, there will be nodal points similar to those of stretched strings. These differences produce differences in the forms of the puffs. We can thus explain the forms of puffs in the different types of vowels by differences in the action of the muscles of the glottal lips. We may assume that these muscles contract differently for the different vowels, the vowel being formed at the glottis as well as in the mouth. This phe- nomenon can be explained by supposing that certain sets of innervations to the fibers of the glottal muscles as well as to the cavity muscles are associated with the sound of each vowel. Physically stated, a vowel consists of a series of explosive puffs of air from the glottis acting on a complicated cavity with considerable friction. The puffs of air may be very brief and may be separated by comparatively long intervals of rest; or they may be of smoother Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Carnegie Institution of Washington. Washington, Carnegie Institution of Washington
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