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- Title
Motor Innervation of the Trapezius Muscle: Intraoperative Motor Conduction Study during Neck Dissection.
- Authors
Kim, Jin Hwan; Choi, Kyu Young; Lee, Kyu Ho; Lee, Dong Jin; Park, Bum Jung; Rho, Young-Soo
- Abstract
Objectives: To evaluate the motor input from the spinal accessory nerve (SAN) and the branches of the cervical plexus in an intraoperative motor nerve conduction study measuring motor action potentials by direct stimulation of the exposed nerve during neck dissection. Methods: The entire length of the SAN and the contributions from the upper cervical plexus were preserved. Compound muscle action potentials were measured for each part of the trapezius muscle on stimulation of the SAN, C2, C3, and C4 nerves. Results: With stimulation of the spinal nerve, evoked responses were obtained from all 24 patients in the descending, transverse, and ascending trapezius muscle. C2 contributions were noted in 2 out of 24 patients; however, no patient revealed responses in all three parts of the muscle. C3 contributions were seen in 11 out of 24 patients, supplying all three parts of the muscle in 8 patients, and C4 contributions were noted in 20 out of 24 patients, supplying all three parts of the muscle in 16 of them. Conclusions: The SAN provided the most consistent motor input to the trapezius muscle. The C2, C3, and C4 nerves also provided motor input to the trapezius muscle; however, they were either inconsistently present or, when present, irregularly innervated the three parts of the trapezius muscle. © 2014 S. Karger AG, Basel
- Subjects
INNERVATION; TRAPEZIUS muscle; ACCESSORY nerve; NEURAL conduction; NECK dissection; SURGERY
- Publication
ORL, 2014, Vol 76, Issue 1, p8
- ISSN
0301-1569
- Publication type
Article
- DOI
10.1159/000358923