Double innervation of the brachialis muscle: anatomic-physiological study.

Surgical and Radiologic Anatomy : SRA
M Bendersky, H F Bianchi

Abstract

Double innervation of the brachialis muscle has been previously reported in anatomical studies. This study aims to investigate the frequency and clinical significance of double innervation of brachialis by anatomical and electromyographic techniques. (1) The existence, origin and pattern of distribution of a branch from the radial nerve to brachialis were dissected on 20 cadaveric arms. (2) Nerve conduction studies (NCS) of 100 patients were performed. The radial nerve was stimulated, registering muscle potentials (MP) in the brachialis muscle. Subsequently, another MP was obtained by Erb's stimulation, corresponding to the whole brachialis innervation. The relative percentage of innervation from the radial nerve was calculated. (3) Two patients with lesions of the lateral cord of the brachial plexus and preserved elbow flexion were submitted to NCS. Double innervation was found in 65 % of the anatomical preparations, following different patterns of distribution. In the NCS, 90% of the patients showed MP in the brachialis muscle after stimulating the radial nerve. The mean percentage of relative innervation was 11 %. Two patients with lesions of the lateral cord showed an important contribution from the radial nerve. Variations...Continue Reading

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Citations

Feb 20, 2013·The British Journal of Radiology·A TagliaficoC Martinoli
Mar 7, 2014·Clinical Anatomy : Official Journal of the American Association of Clinical Anatomists & the British Association of Clinical Anatomists·Sung-Yoon WonHee-Jin Kim
Sep 13, 2017·Surgical and Radiologic Anatomy : SRA·Masahito YamamotoShinichi Abe
Jan 3, 2020·Clinical Anatomy : Official Journal of the American Association of Clinical Anatomists & the British Association of Clinical Anatomists·Courtney Pendleton, Robert J Spinner

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