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December 1986

Brachial Plexus Lesions

Arch Neurol. 1986;43(12):1222. doi:10.1001/archneur.1986.00520120008003

To the Editor.  —I read with great interest the excellent review by Kline et al1 in which the diagnosis and treatment of brachial plexus lesions was discussed. I would dispute the statement that "there are no good sensory stimulation and recording sites to test the C-5 root." The lateral cutaneous nerve of the forearm is a terminal sensory branch of the musculocutaneous nerve, and supplies the lateral volar forearm to the wrist. It has fibers originating primarily from the C-5 root. The techniques of stimulation and recording its sensory nerve action potential are well established.2,3 It is an excellent study for differentiating a preganglionic lesion, such as a C-5 root avulsion, from a postganglionic lesion, such as an upper trunk and/or lateral cord lesion. I think that this study should be done in all patients with a suspected brachial plexus lesion, especially in stretchcontusion injuries in which the

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