Vocal fold vibration viewed from tracheal side

研究了犬发声时声带粘膜的柔韧性与声门下粘膜隆起(MU)位置的关系。声带游离缘的柔韧性最大，向气管侧逐渐减弱，离游离缘最小3 mm。声带张力增加导致柔韧性降低，柔韧性最低点向口侧移动。最小柔韧性的点随着电刺激甲状旁肌(TA)而移向气管一侧。MU发生在柔韧性最小的地方。声带张力的增加导致MU向上移动，略低于最小柔韧性的点。电刺激TA导致MU下移，并根据最小柔韧性的点发生。组织学检查显示，固有层向柔韧性最小的位置和发生MU的位置变得越来越薄。此时，肌层接近上皮层，固有层深层消失。在固有层深层消失并发生MU时，声带的柔韧性最小。

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.