Choi H S, Berke G S, Ye M, Kreiman J
Laryngeal Physiology Laboratory, Division of Head and Neck Surgery, UCLA School of Medicine.
Otolaryngol Head Neck Surg. 1993 Dec;109(6):1043-51. doi: 10.1177/019459989310900612.
The function of the posterior cricoarytenoid (PCA) muscle in phonation has not been well documented. To date, several electromyographic studies have suggested that the PCA muscle is not simply an abductor of the vocal folds, but also functions in phonation. This study used an in vivo canine laryngeal model to study the function of the PCA muscle. Subglottic pressure and electroglottographic, photoglottographic, and acoustic waveforms were gathered from five adult mongrel dogs under varying conditions of nerve stimulation. Subglottic pressure, fundamental frequency, sound intensity, and vocal efficiency decreased with increasing stimulation of the posterior branch of the recurrent laryngeal nerve. These results suggest that the PCA muscle not only acts to brace the larynx against the anterior pull of the adductor and cricothyroid muscles, but also functions inhibitorily in phonation by controlling the phonatory glottal width.
环杓后肌（PCA）在发声中的作用尚未得到充分记载。迄今为止，多项肌电图研究表明，PCA 肌不仅是声带的单纯外展肌，在发声中也发挥作用。本研究采用犬活体喉模型来研究 PCA 肌的功能。在不同神经刺激条件下，从五只成年杂种犬收集声门下压力、电声门图、光声门图和声波形。随着喉返神经后支刺激增加，声门下压力、基频、声音强度和发声效率降低。这些结果表明，PCA 肌不仅起到支撑喉部以抵抗内收肌和环甲肌向前拉力的作用，还通过控制发声声门宽度在发声中起到抑制作用。
