The term medial part of the lateral habenula refers to one of two parts of the lateral habenula of the rat ( Paxinos-2009b ) and mouse ( Franklin-2008 ). The other is the lateral part of the lateral habenula. In this segmentation of the habenula, the medial habenula is not subdivided. Other authors do not subdivide the lateral habenula in the rat ( Swanson-2004 ) but divide the medial habenula into a dorsal part of the medial habenula and ventral part of the medial habenula. Neither nucleus of the habenula is subdivided in the human ( Carpenter-1983 ) or the macaque ( Paxinos-2009a ). Functionally the habenula belongs to the central gray of the behavior control column ( Swanson-2004 ).