Each of the eleventh pair of cranial nerves, supplying certain muscles in the neck and shoulder.
- The spinal accessory nerve and its musculature.
- This area, too, is an area through which a massive tangle of facial nerves (including the hypoglossal and accessory nerves) exit the skull to fan out across the face.
- From its beginning at the 5th cervical segment, the spinal root of the accessory nerve increases in thickness as fibers join it from higher segments.
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