Innervation of the trapezius muscle: is cervical contribution important to its function? |
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| Authors: | Wen Zhao Jian Sun Jia-Wei Zheng Jun Li Yue He Zhi-Yuan Zhang |
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| Affiliation: | Department of Oral and Maxillofacial Surgery, The Ninth People's Hospital of Shanghai, School of Stomatology, Shanghai Jiaotong University, Shanghai, PR, China. |
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| Abstract: | OBJECTIVE: To study the effect of the cervical plexus and the accessory nerve to the function of the trapezius muscle. STUDY DESIGN AND SETTING: Eighteen adult male Sprague-Dawley rats were randomly divided into three groups. The neurotomies were performed in the left sides and the right sides served as within-subject controls. In group A, the accessory nerve was transected. The C2-5 were transected in group B, and both of the accessory nerve and C2-5 were cut in group C. The electrophysiologic, myophysiologic, and histologic changes of the muscles were measured. RESULTS: There were significant differences (P < 0.05) between the three groups in the recovery rates of the transverse area of the muscles. The CMAP recorded from the experimental sides in group B were similar to the control sides. The values of the maximum tension of the tetanus contraction between the two sides showed no differences either (P > 0.05). CONCLUSION: The accessory nerve supplies the most important motor input to the trapezius. Motor innervations of the cervical plexus are not very significant. |
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