Sanders I, Rai S, Han Y, Biller H F
The Grabscheid Voice Center, Department of Otolaryngology, Mount Sinai Medical Center, New York, New York 10029, USA.
Ann Otol Rhinol Laryngol. 1998 Oct;107(10 Pt 1):826-33. doi: 10.1177/000348949810701003.
It is not understood how different parts of the thyroarytenoid muscle contribute to vocal fold vibration. This study investigated the medial part of the thyroarytenoid muscle, the vocalis compartment, for anatomic differences that might suggest functionally distinct areas. Twenty human vocal folds were frontally sectioned and stained with hematoxylin and eosin. A single section from the middle of each vocal fold was magnified, and the muscle fascicles of the most superficial 25% of the vocalis compartment were then examined. In all 20 specimens the vocalis compartment could be separated into 2 plainly distinct subcompartments: the inferior vocalis compartment was composed of a single large muscle fascicle that contained densely packed muscle fibers of similar size; the superior vocalis compartment was composed of multiple small fascicles in which the muscle fibers were loosely arranged and varied greatly in size. On average, the inferior vocalis subcompartment composed 60% of the medial surface of the thyroarytenoid muscle. The superior subcompartment composed the remaining 40% of the medial surface, but also continued past the vocal ligament to make up the superior surface of the thyroarytenoid muscle. It is concluded that 2 distinct entities make up the vocalis compartment of the thyroarytenoid muscle. Their anatomy is so markedly different it suggests that they may function independently. One possibility is that they reflect the 2 masses observed in the superior and inferior aspects of the vocal fold during vibration.
目前尚不清楚甲杓肌的不同部分如何对声带振动产生影响。本研究调查了甲杓肌的内侧部分，即声带肌区，以寻找可能暗示功能不同区域的解剖学差异。对20条人类声带进行额状切片，并用苏木精和伊红染色。放大每条声带中部的单个切片，然后检查声带肌区最表层25%的肌束。在所有20个标本中，声带肌区可明显分为2个不同的亚区：下部声带肌区由单个大肌束组成，其中包含紧密排列的大小相似的肌纤维；上部声带肌区由多个小肌束组成，其中肌纤维排列松散，大小差异很大。平均而言，下部声带肌亚区占甲杓肌内侧表面的60%。上部亚区占内侧表面的其余40%，但也延伸至声带韧带之外，构成甲杓肌的上表面。得出的结论是，甲杓肌的声带肌区由2个不同的实体组成。它们的解剖结构差异如此明显，表明它们可能独立发挥作用。一种可能性是，它们反映了振动过程中在声带上下方面观察到的2个质量块。
