环甲肌的解剖形态和生理功能的再认识

Reauthentcaed study on the morphology and function of the criothyreoideus

目的：为了重新认识环甲肌的形态和功能。方法：用６０个经福尔马林固定的成人尸体喉，在手术显微镜下对环甲肌进行解剖观测；用８条中国犬在手术麻醉下对环甲肌进行电生理实验。结果：电刺激单侧和双侧环甲肌，甲状软骨都固定不动，环状软骨运动；切断一侧喉上神经喉外支，使该侧环甲肌瘫痪，用直接喉镜观察声门，可见声门后端向患侧偏斜。结论：环甲肌属于二头肌，起于甲状软骨，止于环状软骨；环甲肌收缩时，甲状软骨固定，环状软骨活动；一侧环甲肌瘫痪时，环状软骨弓向健侧偏转，声门后端向患侧偏斜。

bjective:To reauthenticate the morphology and function of the cricothyreoideus. Methods:60 antiseptic adult cadavers were anatomized and obsevred by surgery microscope;8 Chinese dogs were utilized for electrophyasiologyic experiment of the cricothyreoideus.Results:Under monolateral or bilateral cricothyreoideus stimulation,the thgroid cartilage is stable and the cricoid cartilage is moving.Cutting off monolaterally the external branch of superior laryngeal nerve,the correspondont cricothyreoideus paralyses and the posterior end of the glottis slants towards the paralysed side.Conclusions:The cricothyreoideus belongs to the biceps.It originates from the thyroid cartilage and ends at the cricoid cartlage.In monolateral cricothyreoideus paralys,the arch of cricoid cartilage deflects towards the perfect side,the posterior end of the glottis slants towards the paralysed side.