Koizumi H, Kogo M, Matsuya T
First Department of Oral and Maxillofacial Surgery, Osaka University Faculty of Dentistry, Japan.
Cleft Palate Craniofac J. 1996 Nov;33(6):459-62. doi: 10.1597/1545-1569_1996_033_0459_cbpalm_2.3.co_2.
The soft palate and larynx play an important role in respiration and phonation, regulating the airflow in the upper airway. The levator veli palatini muscle (LVP) is the principal muscle responsible for generating palatal movements. The lateral cricoarytenoid muscle (LCA) is a laryngeal adductor muscle, and the posterior cricoarytenoid muscle (PCA) is a laryngeal abductor muscle. This study was designed to define, by electromyographic techniques, the coordination between palatal and laryngeal muscle activities in response to rebreathing and lung inflation. We performed tracheotomies on 12 mongrel dogs anesthetized with sodium pentobarbital and compared the effects of rebreathing and lung inflation on LVP activities with those on LCA and PCA activities. During rebreathing, expiratory LVP and inspiratory PCA activities were progressively augmented, but expiratory LCA activity was inhibited. On the other hand, lung inflation caused augmentation of LVP and LCA activities. In contrast, lung inflation inhibited PCA activity. We thus concluded that LVP activity coordinates with PCA activity in response to alternation of Paco2 and Pao2 levels, while it coordinates with LCA activity in response to lung inflation.
软腭和喉部在呼吸和发声中起着重要作用，调节上呼吸道的气流。腭帆提肌（LVP）是产生腭运动的主要肌肉。环杓侧肌（LCA）是喉部内收肌，而环杓后肌（PCA）是喉部外展肌。本研究旨在通过肌电图技术确定在重复呼吸和肺充气时腭部和喉部肌肉活动之间的协调性。我们对12只戊巴比妥钠麻醉的杂种犬进行了气管切开术，并比较了重复呼吸和肺充气对LVP活动的影响与对LCA和PCA活动的影响。在重复呼吸期间，呼气时的LVP活动和吸气时的PCA活动逐渐增强，但呼气时的LCA活动受到抑制。另一方面，肺充气导致LVP和LCA活动增强。相反，肺充气抑制PCA活动。因此，我们得出结论，LVP活动在应对Paco2和Pao2水平变化时与PCA活动协调，而在应对肺充气时与LCA活动协调。
