Yan J, Wu H, Aizawa Y, Horiguchi M
Department of Anatomy, Iwate Medical University School of Medicine, Morioka, Japan.
Okajimas Folia Anat Jpn. 1999 Oct;76(4):149-55. doi: 10.2535/ofaj1936.76.4_149.
For the sake of clarifying which division of the brachial plexus, anterior or posterior, does the human suprascapular nerve belong to, the suprascapular nerve and cervical nerves concerned were teased into bundles of fibers by the fiber analysis method in six adult human arms of cadavers. The suprascapular nerve received fibers from C4, C5 and C6 in two cases which have a communicating branch between C4 and C5, from C6 and C6 in three cases and only from C5 in one case. In contrast with the posterior root fibers, the anterior root fibers of C5 and C6 could easily be divided into anterior and posterior groups of bundles which entered the anterior and the posterior divisions of the brachial plexus and were called anterior motor and posterior motor elements respectively. The suprascapular nerve received fibers from the anterior and the posterior motor elements of C5 in all cases. In addition to the C5, the nerve received fibers from both elements of C6 in three cases or from the anterior element of C6 in two cases. From this result the suprascapular nerve is judged to be a nerve which belongs to both anterior and posterior divisions of the brachial plexus.
为了明确人类肩胛上神经属于臂丛神经的前支还是后支，采用纤维分析法，在6具成人尸体手臂标本上，将肩胛上神经及相关颈神经分离成纤维束。肩胛上神经在2例中接受来自C4、C5和C6的纤维（C4和C5之间有交通支），3例中接受来自C5和C6的纤维，1例中仅接受来自C5的纤维。与后根纤维不同，C5和C6的前根纤维很容易分成前后两组纤维束，分别进入臂丛神经的前支和后支，分别称为前运动成分和后运动成分。肩胛上神经在所有病例中均接受来自C5的前运动成分和后运动成分的纤维。除C5外，该神经在3例中接受来自C6的前后两个成分的纤维，在2例中接受来自C6的前成分的纤维。由此结果判断，肩胛上神经属于臂丛神经的前支和后支。
