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Korean Journal of Otorhinolaryngology-Head and Neck Surgery > Volume 39(5); 1996 > Article
Korean Journal of Otorhinolaryngology-Head and Neck Surgery 1996;39(5): 825-30.
The Double Innervation of the Thyroarytenoid Muscle and It's Central Projection in Dog
Young Mo Kim, MD1, Joon Hyung Kim, MD1, and G.S. Berke, MD2
1;Department of Otolaryngology, College of Medicine, Inha University, Incheon, Korea, 2;Division of Head & Neck Surgery, UCLA, Los Angeles, USA
개의 갑상피열근에 대한 상후두신경 외지의 운동신경 지배와 중추 투사
김영모1 · 김준형1 · G.S. Berke2
인하대학교 의과대학 이비인후과학교실1;,Division of Head & Neck Surgery, UCLA, Los Angeles, USA2;

Recent studies have detailed the existence of a cross-innervating branch of the extenal superior laryngeal nerve(ExSLN) to the thyroarytenoid muscle(TA). To verify and determine the nature of this additional innervation, a retrograde transport technique with horseradish peroxidase(HRP) was used. Injection of HRP to the TA, after having removed 1cm of the reccurent laryngeal nerve(RLN) innervating this muscle, resulted in retrograde labeling of the motor neurons in the nucleus ambiguus(NA) in 2 out of 6 canines. HRP labeled neurons were distributed rostrocaudally from 1.5mm rostral to the obex with about 2.5mm of caudal extension. This segment corresponded to the area of TA motor neurons from the RLN. We conclude that the TA can receive a second motor innervation from a branch of the ExSLN in some cases. This additional neural motor innervation of the TA not only has a basic interest but also may contribute to understanding phonation, as well as clinical issues in some neurological laryngeal disease.

Keywords: Central projectionDouble innervationLaryngeal innervationReccurent laryngeal nerveSuperior laryngeal nerveThyroarytenoid muscle.
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