Kadota Y
Department of Otolaryngology, School of Medicine, Ehime University.
Nihon Jibiinkoka Gakkai Kaiho. 1994 Aug;97(8):1423-36. doi: 10.3950/jibiinkoka.97.1423.
Mucosal pliability was measured in 23 excised larynges, 19 canine and four human, at the three portions of the vocal fold, namely the midline, the anterior 1/4 and the posterior 1/4. The pliability at the midline showed a greater value than those at the other two portions. 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 of the fold. An increase in vocal fold tension resulted in lowering of mucosal pliability at all measured points and the point of minimal pliability shifted toward the oral side. The point of minimal pliability moved toward the tracheal side with direct electrical stimulation of the thyroarytenoid muscle (TA). Both pliability measurement and observation of mucosal vibration from the tracheal side using high speed cinematography or stroboscopy were performed on eleven of the excised canine larynges. The mucosal upheaval occurred at the point around which pliability was minimal. An increase in vocal fold tension resulted in an upward shift of the mucosal upheaval which occurred slightly below the point of minimal pliability. Electric stimulation of the TA resulted in a downward shift of the mucosal upheaval which occurred in accordance with the point of minimal pliability. Histological examination of the canine larynges revealed that the lamina propria became increasingly thin toward the point around which pliability was minimal and at which the mucosal upheaval occurred. At this point, the muscle layer approximated the epithelial layer with disappearance of the deep layer of the lamina propria. The point shifted to the oral side following an increment in vocal fold tension, while the point moved toward the tracheal side following contraction of the TA. Pliability of the vocal fold is minimal at the point around which the deep layer of the lamina propria disappears and the mucosal upheaval occurs.
在23个切除的喉部标本（19个犬类喉部和4个人类喉部）的声带三个部位，即中线、前1/4和后1/4处，测量黏膜柔韧性。中线处的柔韧性值高于其他两个部位。声带游离缘显示出最大柔韧性，该柔韧性朝着气管侧逐渐减小，在距声带游离缘3mm处达到最小值。声带张力增加导致所有测量点的黏膜柔韧性降低，且最小柔韧性点向口侧移动。直接电刺激甲杓肌（TA）时，最小柔韧性点向气管侧移动。对11个切除的犬类喉部标本进行了柔韧性测量，并使用高速电影摄影或频闪喉镜从气管侧观察黏膜振动。黏膜隆起发生在柔韧性最小的点周围。声带张力增加导致黏膜隆起向上移位，该隆起发生在略低于最小柔韧性点的位置。电刺激TA导致黏膜隆起向下移位，该隆起与最小柔韧性点一致。对犬类喉部的组织学检查显示，固有层朝着柔韧性最小且黏膜隆起发生的点逐渐变薄。在这一点上，肌肉层接近上皮层，固有层深层消失。随着声带张力增加，该点向口侧移动，而随着TA收缩，该点向气管侧移动。在固有层深层消失且黏膜隆起发生的点周围，声带柔韧性最小。
