The innervation of the trapezius muscle: a cervical motor supply

Stacey, R; O’Leary, S.; Hamlyn, Peter J.

doi:10.1016/s1010-5182(05)80216-1

Cited by 21 publications

(22 citation statements)

References 4 publications

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“…There is still considerable controversy among surgeons about the exact motor innervation of the trapezius muscle [9,10,11]. Along with the SAN, the cervical nerves either run independently to the trapezius muscle or form a plexus with the SAN before entering this muscle [12].…”

Section: Discussionmentioning

confidence: 99%

Motor Innervation of the Trapezius Muscle: Intraoperative Motor Conduction Study during Neck Dissection

Kim¹,

Choi²,

Lee³

et al. 2014

ORL

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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.

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Section: Discussionmentioning

confidence: 99%

Motor Innervation of the Trapezius Muscle: Intraoperative Motor Conduction Study during Neck Dissection

Kim¹,

Choi²,

Lee³

et al. 2014

ORL

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“…The direction in which the bridging fibers conduct impulses could not be determined in this study. However, when considering the branches from the cervical plexus to the trapezius muscle independent of the accessory nerve (Soo et al, 1986;Stacey et al, 1995Stacey et al, , 1996 and the histochemical demonstration of motor fibers in the C3 and C4 nerves for innervation of the trapezius muscle (Karuman and Soo, 1996), the accessory motor fibers derived from the spinal cord as the spinal rootlets may join the posterior root through the bridging fibers (Fig. 5).…”

Section: Discussionmentioning

confidence: 99%

“…It has been reported, however, that not all patients suffered from the shoulder syndrome after surgery (Weitz et al, 1982). This phenomenon has been explained as due to the innervation of the trapezius muscle by cervical nerves, independent of the spinal accessory nerve (Soo et al, 1986;Stacey et al, 1995Stacey et al, , 1996.…”

Section: Introductionmentioning

confidence: 99%

Intradural anastomoses between the accessory nerve and the posterior roots of cervical nerves: Their clinical significance

Chung

Koh

et al. 2001

Clinical Anatomy

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This study was performed to identify the anastomoses between the accessory nerve and the posterior roots of cervical nerves below the level of C1 segment, and to evaluate their clinical significance. One hundred spinal cord sides of Koreans were studied under the surgical microscope. In order to trace the posterior root of a cervical nerve after anastomosis with the accessory nerve, or the bridging fibers between the accessory nerve and the cervical posterior roots, the accessory nerves with the posterior roots and the bridging fibers were stained with osmium tetroxide. The anastomosis was classified into five types, according to whether the accessory nerve and the cervical posterior root crossed each other, and also according to the site of the bridging fiber between them. The bridging fibers in the most common type of anastomoses were observed to connect the posterior roots of a cervical nerve with the spinal rootlet of the accessory nerve. The possibility that the motor fibers of accessory nerve from the spinal cord may innervate the trapezius muscle through the cervical nerve, was discussed.

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“…From the punctum nervosum, the accessory nerve courses inferolaterally, then ramifies into numerous branches supplying the trapezius (Aramrattana et al, 2005;Clemente, 1985;Dailiana et al, 2001;Kierner et al, 2000;Roman 1981;Shiozaki et al, 2000) (Fig.9). In addition to the accessory nerve, motor branches of the cervical plexus derived from the C2-C3 anterior rami participate in innervation of the sternocleidomastoid and trapezius muscles (Aramrattana et al, 2005;Bertrand, 2004;Clemente, 1985;Dailiana et al, 2001;Pu et al, 2008;Roman 1981;Stacey et al, 1995;Zhao et al, 2006). Among the entire phalanx of nerves to both the muscles, multiple variations can be encountered during surgical exploration (Brennan et al, 2002;Brown et al, 1988;Caliot et al, 1984Caliot et al, , 1989Latarjet, 1948;Stacey et al, 1995;Taira, 2009) (Fig.10 and Fig.11).…”

Section: Surgical Anatomy Of the Accessory Nerve And Its Peripheral Bmentioning

confidence: 99%

“…The nerves which contribute to the innervation of cervical dystonic muscles are summarized in Table 3 ( Anderson et al, 2008;Aramrattana et al, 2005;Bertrand, 2004;Clemente, 1985;Dailiana et al, 2001;Frank et al, 1997;Kierner et al, 2000;Pu et al, 2008;Roman, 1981;Stacey et al, 1995;Taira, 2009;Zhao et al, 2006 Table 3. The muscles in the neck region associated with cervical dystonia and their nerve supply…”

Section: Conclusion Of the Nerve Supplymentioning

confidence: 99%