Vagal origin of the ANSA cervicalis nerve - report of two cases.

Ansa cervicalis is a loop of nervers usually by C1, C2 and C3 fibres in the lateral aspect of the neck, Occasionally the superior root of the ansa (derived from C1) may original from the vagus either party or entirely, but the fibres can be traced back to their true cases of ansa cervicalis arising from the nagal trunk observed in dissection room cadavers is described here. Since the ansa cervicalis is frequently used in reinnervation of the paralyzed larynx, awareness of such a variation will be of use to the surgeon during a surgical procedure.