Superior Laryngeal Nerve

Internal Branch

External Branch

As a branch of the vagus nerve in the head/neck region, the Superior Laryngeal nerve exits from the inferior ganglion, and passes downward to the thyrohyoid membrane. The internal branch of the superior laryngeal penetrates the thyrohyoid membrane to innervate the mucosa of the larynx above the visceral folds. The external branch of the superior laryngeal continues on the external surface of the inferior pharyngeal constrictor and ramifies to innervate the inferior pharyngeal constrictor and cricothyroid muscles.