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International Journal of Morphology

On-line version ISSN 0717-9502

Abstract

NAMKING, Malivalaya et al. Incidence of Unusual Formation of the Median Nerve in Thai-Northeast Embalmed Cadavers. Int. J. Morphol. [online]. 2017, vol.35, n.1, pp.52-55. ISSN 0717-9502.  http://dx.doi.org/10.4067/S0717-95022017000100010.

This study aimed to investigate the incidence of unusual formation of the median nerve in Thai cadavers. Two hundred and ninety-two upper limbs were dissected and observed. The results showed that 5 out of 292 (1.71 %) arms had unusual splitting of median nerve that supplied the flexor arm muscles. Concomitantly, the musculocutaneous nerve was absent. In 4 out of 5 variant arms (80 % or 1.37 % of total upper limbs), each median nerve was unusually formed by 3 roots; the first and second roots were from lateral cord and the third one from medial cord. The union of the second lateral and medial roots to become a median nerve distantly extended in the arm. The second lateral roots gave off small muscular branches to the upper part of flexor arm muscles. Knowledge of such anatomical variations is helpful for surgeons in performing of brachial plexus surgery.

Keywords : Anatomical ariation; Median nerve; Upper limbs; Thai cadavers.

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