The term medial periolivary nucleus refers to one of four cell groups identified by Nissl stain in the periolivary region of the superior olivary complex of the human ( Amunts-2012 ). The others are the dorsomedial periolivary nucleus, the ventral periolivary nucleus, and the rostral periolivary region. Functionally it is part of the subcortical auditory system ( Swanson-2004 ).