Three laryngeal nerves (i.e., recurrent laryngeal nerve, RLN; external and internal superior laryngeal nerves, ESLN and ISLN), three muscles (i.e., thyroarytenoid, TA; posterior cricoarytenoid, PCA; and cricothyroid, CT), and three mucosa samples overlying the larynx and laryngopharynx (i.e., true vocal fold, TVF; laryngeal surface of the epiglottis, LSE; and aryepiglottic fold, AEF) were examined to detect phosphorylated α-synuclein (PAS) aggregates, the pathological hallmark of PD. Here, SNCA is linked to Parkinson disease.