This motor nucleus extends from C5 or C6 to the level of the decussation of the pyramids, and occupies the lateral region of the anterior horn in the spinal cord. Its axons travel in CN XI to innervate the trapezius and sternocleidomastoid muscles. There is disagreement as to whether it is a GSE ((General somatic efferent)or a SVE (Special Visceral Efferent). Haines says GSE, Blumenfeld says SVE.
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