1994 Fiscal Year Final Research Report Summary
Vocal fold vibration viewed from tracheal side
| Project/Area Number |
05671431
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| Research Category |
Grant-in-Aid for General Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Research Field |
Otorhinolaryngology
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| Research Institution | Ehime University |
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Principal Investigator |
YUMOTO Eiji Ehime University, School of Medicine, Assistant Professor, 医学部・付属病院, 講師 (40116992)
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| Co-Investigator(Kenkyū-buntansha) |
HYODO Masamitsu Ehime University, School of Medicine, Research Associate, 医学部・付属病院, 助手 (00181123)
MORI Toshihiro Ehime University, School of Medicine, Research Associate, 医学部, 助手 (50200374)
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| Project Period (FY) |
1993 – 1994
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| Keywords | Vocal fold vibration / Phonation / Mucosal wave / Lower surface of the vocal fold / Mucosal upheaval / Mucosal pliability / Vocal fold tension / Thyroarytenoid muscle |
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| Research Abstract |
Pliability of the canine vocal fold mucosa in relation to the location of the subglottic mucosal upheaval (MU) during phonation was investigated. The free edge of the vocal fold showed a maximum pliability which gradually diminished toward the tracheal side and reached a minimum 3mm from the free edge. An increase in vocal fold tension resulted in lowering of pliability and the point of minimal pliability shifted toward the oral side. The point of minimal pliability moved toward the tracheal side with electrical stimulation of the thyroarytenoid muscle (TA) . The MU occurred where pliability was minimal. An increase in vocal fold tension resulted in an upward shift of the MU which occurred slightly below the point of minimal pliability. Electrical stimulation of the TA resulted in a downward shift of the MU which occurred in accordance with the point of minimal pliability. Histological examination revealed that the lamina propria became increasingly thin toward the point where pliability was minimal and where the MU occurred. At this point, the muscle layr approximated the epithelial layr with disappearance of the deep layr of the lamina propria. Pliability of the vocal fold is minimal at the point where the deep layr of the lamina propria disappears and the MU occurs.
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