Anatomic Confirmation of the Motor Fibers in the Cervical Nerves Innervating to the Trapezius Muscle.

Author: Jung Su WOO ¹ ; Mi Sun HUR ; Bum Seung KANG ; Seon Young PARK ; Kyu Seok LEE
Author Information

1. Department of Anatomy, Kwandong University College of Medicine, Gangneung, Korea. kslee@kd.ac.kr
Publication Type:Original Article
Keywords: Motor fiber; Cervical nerve; Trapezius muscle
MeSH: Muscles
From:Korean Journal of Physical Anthropology 2012;25(1):63-66
CountryRepublic of Korea
Language:English
Abstract: 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.