SYN: accessory. [L.]
- a. willisii SYN: accessory nerve [CN XI].
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1) a muscle reinforcing the action of another
2) ACCESSORY NERVE
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ac·ces·so·ri·us (ak″ses-oґre-əs) [L. “supplementaryâ€] accessory; used in naming certain structures thought to serve a supplementary function.Medical dictionary. 2011.