Right-side carotid sheath of a pig post dissection showed the cut SLN and its surrounding structures. One end is knotted with black silk suture, in the lower-left corner of the photo, originated from the nodose ganglion of the cervical vagus nerve. The other end, in the lower-right corner of the photo, pierced through the thyrohyoid membrane into the larynx CCA common carotid artery, CV cervical vagus nerve, IJV internal jugular vein, NG nodose ganglion, SCG superior cervical sympathetic ganglion, SLN superior laryngeal nerve