Abstract
Parkinson's disease (PD) is a chronic, neurodegenerative and progressive disease. According to Braak (2004), the progression of the Parkinson's disease is divided into two phases, presymptomatic and symptomatic. In the pre-symptomatic phase, involvement is observed in the dorsal nucleus of the vagus nerve (specifically in the pharyngeal branch of the vagus nerve and in the internal superi…