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KMID : 0855520120250010063
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Korean Journal of Physical Anthropology
2012 Volume.25 No. 1 p.63 ~ p.66
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Anatomic Confirmation of the Motor Fibers in the Cervical Nerves Innervating to the Trapezius Muscle
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Woo Jung-Su
Hur Mi-Sun
Kang Bum-Seung
Park Seon-Young
Lee Kyu-Seok
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Abstract
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This study aimed to confirm the presence of motor fibers in the cervical nerves distributing to the trapezius muscle.
Thirteen cases were examined. Motor fibers were present in C3 in 7 of 9 cases(77.8%) and were absent in 2 of 9 cases(22.3%); the other 4 cases were damaged during dissection. C4 exhibited motor fibers in 9 of 10 cases(90.0%), whereas motor fibers were absent in 1 of 10 cases(10.0%); and 3 cases were damaged.
The motor fibers in C3 were of medium size(57.1%; 4/7 cases), whereas those in C4 were large(44.4%; 4/9 cases). The average number of motor fibers in C3 and C4 were 114±112 and 219±167, respectively.
These results show that C4 is more important in terms of the frequency and size of the cervical motor fibers distributing to the trapezius muscle.
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KEYWORD
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Motor fiber, Cervical nerve, Trapezius muscle
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