FTP, name this major parasympathetic nerve, symbolized X (ten), the longest cranial nerve.
Its only cutaneous innervation is a part of the external ear, where irritation may lead to a referred cough due to this nerve's motor innervation of most of the throat.  This nerve also splits branches off that innervate the larynx and control the voice, but its better known function is mediated by nerve branches to the heart, lungs, and gut.  FTP, name this major parasympathetic nerve, symbolized X (ten), the longest cranial nerve.
Its only cutaneous innervation is a part of the external ear, where irritation may lead to a referred cough due to this nerve's motor innervation of most of the throat.  
vagus nerve