A group of neurons embedded in the pontine central gray of the pontine tegmentum. Located dorsal to the internal genu of the facial nerve, it is found in the human ( Paxinos-2012 ), the macaque ( Paxinos-2009a ), the rat ( Swanson-2004 ), and the mouse ( Franklin-2008 ). Functionally it is part of the dorsal pontine gray of the subcortical motor system ( Swanson-2004 ) [ ]