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Journal of Hand Surgery (British and European Volume)
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Surgical Anatomy of Spinal Accessory Nerve: Is Trapezius Functional Deficit Inevitable after Division of the Nerve?

Z. H. DAILIANA
H. MEHDIAN
A. GILBERT

From the Institute de la Main, Paris, France

Correspondence: Dr Alain Gilbert, Institut de la Main, 6, Square Jouvenet 75016 Paris, France

The course of spinal accessory nerve in the posterior triangle, the innervation of the sternocleidomastoid and trapezius muscles and the contributions from the cervical plexus were studied in 20 cadaveric dissections. The nerve was most vulnerable to iatrogenic injuries after leaving the sternocleidomastoid. Direct innervation of trapezius by cervical plexus branches was noted in five dissections, whereas connections between the cervical plexus and the spinal accessory nerve were observed in 19 dissections. These were usually under the sternocleidomastoid (proximal to the level of division of the nerve in nerve transfer procedures). Although the contribution from the cervical plexus to trapezius innervation is considered minimal, trapezius function can be protected in neurotization procedures by transecting the spinal accessory nerve distal to its branches to the upper position of trapezius.

Journal of Hand Surgery (British and European Volume), Vol. 26, No. 2, 137-141 (2001)
DOI: 10.1054/jhsb.2000.0487
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