The term medial part of the solitary nucleus refers to one of five to twelve subdivisions of the solitary nucleus in the medulla of the human ( Paxinos-2012 ), the macaque ( Paxinos-2009a ), the rat ( Paxinos-2009b ) and the mouse ( Franklin-2008 ). In the solitary nucleus (Swanson) it is subdivided into the rostromedial zone of the solitary nucleus and the caudomedial zone of the solitary nucleus, which belong functionally to the medullary gustatory area and the viscerosensory nuclei respectively ( Swanson-2004 ).