Heffron C J, Baker G J
Equine Vet J. 1979 Jul;11(3):137-41. doi: 10.1111/j.2042-3306.1979.tb01325.x.
Cine-endoscopy was used to study the deglutition reflex in 2 apparently normal horses. Closure of the nasopharyngeal sphincter was brought about by a lowering of the pharyngeal roof and an elevation of the soft palate caudal to the pharyngeal ostia of the auditory tubes. The medial cartilages of the ostia were not directly involved in bringing about closure of the sphincter. It is postulated that the opening of the ostia of the auditory tubes is brought about during deglutition by the combined action of the palatopharyngeus, pterygopharyngeus and tensor veli palatini muscles.
采用电影内窥镜技术对2匹看似正常的马的吞咽反射进行了研究。鼻咽括约肌的关闭是通过咽顶的下降和咽鼓管咽口后方软腭的抬高实现的。咽鼓管开口处的内侧软骨并未直接参与括约肌的关闭过程。据推测，在吞咽过程中，腭咽肌、翼咽肌和腭帆张肌的联合作用导致咽鼓管开口打开。
