A variant case of ansa cervicalis

Ansa cervicalis is a nerve anastomosis innervating infrahyoid muscles. Due to its topographic and functional relationship to the larynx, it is used for re-innervating surgical procedures with a damaged recurring laryngeal nerve. Being familiar with the variations in terms of the origin, placement, and branching is important for surgeons. The casuistics described above concerns the location of ansa cervicalis medial to the carotid sheath.