SUMMARY
Background. The dual innervation of the brachialis muscle by musculocutaneous and radial nerves has been described and adopted, despite being traditionally known to have singular innervation as other flexors in the anterior compartment of the arm. However, the prevalence, course and patterns of distribution of its radial innervation varies in different population, and in the Ghanaian population, no information has been described.
Methods. Thirty-eight (n = 38) cadaveric upper limbs (18 paired and 2 single), routinely used by medical students at the Department of Anatomy and Cell Biology, University of Cape Coast, Ghana, were dissected. The brachialis muscle was exposed in its entire length, and the radial nerve exposed in its course from the spiral groove to the elbow, noting the presence or absence of radial branches to the muscle, number of branches, nature and pattern of branching, level at which the branching occurred, and the level at which branches pierced the muscle.
Results. All specimens were innervated by the musculocutaneous nerve, 76.3% had dual innervation. The radial nerve originated and pierced the muscle at varying levels. Sixty nine percent had solitary radial nerve fibre, and 31.0% had multiple branching patterns. None had more than 2 branches of the radial nerve. The prevalence of dual innervation of the brachialis muscle in the Ghanaian population appears to be high, and the pattern of branching and distribution of the radial nerve fibres differ from those reported in earlier studies.
Conclusions. This knowledge is invaluable in choosing surgical approaches so as to minimize denervation of the brachialis muscle.
Radial Nerve Innervation of the Brachialis Muscle in the Ghanaian Population
A. A. Brown, N. O. Dike
Original Article, 60-64
Keywords: Brachialis, Ghana, humerus, musculocutaneous nerve, radial nerve,
Table of Content: Vol. 12 (No.1) 2022 January/March
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