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Facial
1%
11/806
Superior laryngeal
44%
357/806
Vagus
7%
56/806
Hypoglossal
43%
344/806
Phrenic
3%
24/806
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The hypoglossal nerve exits from the ansa cervicalis at approximately the C2-3 level and can be injured during retraction up to the C2 level. The superior laryngeal nerve lies at about C4-5. The facial nerve is much higher. The vagus nerve runs with the internal jugular and carotid much more laterally. The phrenic nerve exits posteriorly.
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