Iwamoto S, Kimura K, Takahashi Y, Konishi M
Department of Anatomy, National Defense Medical College, Saitama, Japan.
Okajimas Folia Anat Jpn. 1990 May;67(1):47-52. doi: 10.2535/ofaj1936.67.1_47.
Fascicular arrangement of the human brachial plexus is examined on 2 common cases and 3 peculiar cases in which a communicating branch was observed between the median and the musculocutaneous nerve. The musculocutaneous nerve consitss of spinal nerves from C.5, 6 and 7. The branch to the coracobrachialis receives its fibers from C.7 before it leaves the musculocutaneous nerve in 3 cases and after it leaves the musculocutaneous nerve in one case. In one case, C.7 does not send a branch to the coracobrachialis. The median nerve arises by two roots, one from the lateral cord, and the other from the medial cord of the brachial plexus. In a case in which a communicating branch was observed from the median nerve to the musculocutaneous, the fibers from C.7 join to the median nerve via the medial cord. Thus the median nerve involved all elements of the spinal nerve from C.5 to T.1. The elements of the median and the musculocutaneous nerves, therefore, are not affected by appearance of the communicating branch. The communicating branch between the median and the musculocutaneous nerves, consists of the fibers arose from C.5 and C.6, in all examined cases.
在2例常见病例和3例特殊病例中检查了人类臂丛神经的束状排列，其中在正中神经和肌皮神经之间观察到一条交通支。肌皮神经由来自C5、C6和C7的脊神经组成。在3例中，至肱二头肌的分支在离开肌皮神经之前从C7接收纤维，在1例中在离开肌皮神经之后接收纤维。在1例中，C7不向肱二头肌发送分支。正中神经由两个根发出，一个来自臂丛神经的外侧束，另一个来自内侧束。在观察到从正中神经到肌皮神经有交通支的病例中，来自C7的纤维通过内侧束与正中神经相连。因此，正中神经包含了从C5到T1的脊神经的所有成分。因此，正中神经和肌皮神经的成分不受交通支出现的影响。在所有检查的病例中，正中神经和肌皮神经之间的交通支由来自C5和C6的纤维组成。
