Emsley J G, Davis M D
Department of Anatomy and Neurobiology, Dalhousie University, Halifax, Nova Scotia, Canada.
Clin Anat. 2001 Sep;14(5):383-6. doi: 10.1002/ca.1068.
We report here the partial unilateral absence of the trapezius muscle found during dissection. The left trapezius was significantly reduced in size when compared to the right trapezius, especially in its inferior third. Moreover, the existing fibers of the left trapezius inferior to the scapula were only one-third to two-thirds as thick as those on the right. The vertebral attachment of the inferior fibers of the left trapezius was also notably higher than that on the right. Morphometric analysis indicated that the surface area of the left trapezius was approximately 50% that of the right trapezius. Fiber orientation along the left and right trapezius muscles was also markedly different. An examination of nerve supply yielded no apparent anomalies, therefore suggesting that the absence of trapezius has a developmental etiology.
我们在此报告在解剖过程中发现的斜方肌部分单侧缺失情况。与右侧斜方肌相比，左侧斜方肌的尺寸明显减小，尤其是在其下三分之一部分。此外，左侧斜方肌在肩胛骨下方的现有纤维厚度仅为右侧的三分之一至三分之二。左侧斜方肌下部纤维的椎骨附着点也明显高于右侧。形态计量分析表明，左侧斜方肌的表面积约为右侧斜方肌的50%。左右斜方肌的纤维方向也明显不同。对神经供应的检查未发现明显异常，因此表明斜方肌缺失具有发育病因。
