medial-external axis medial-radial axis spatial wasila.dahdul In plants, lateral growth (http://purl.obolibrary.org/obo/GO_0080190) run is along the medial/radial axis (from medial to radial) [RW]. Also applies to radially symmetrical animals such as sea urchins, cnidarians [PM] or applies to more-or-less cylindrical body parts in animals, like limbs. An anatomical axis that is perpendicular to an apical/basal axis or proximal/distal axis and extends from the center of an axis (shoot axis or root in the case of plants) to any point on the exterior of the axis. BSPO:0000197 MR axis 2013-07-02T11:23:31Z M-R axis