A rare case of formation of double ansa cervicalis

Ansa cervicalis is a loop of nerves found in the anterior wall of the carotid sheath in the carotid triangle. The descendens hypoglossi branch of hypoglossal nerve joins the descendens cervicalis, formed by branches from the second and third cervical nerves, to form the ansa cervicalis. The ansa cervicalis nerve formation is relatively complex, as its course and location along the great vessels of the neck vary. In the present case, on the right side of the neck of a 55 year old male cadaver we observed a rare case of formation of double ansa cervicalis, due to the variation in the course of C1 fibers.