part_of part of part of has component has component independent continuant dorsal-ventral axis whole organism dorsal-ventral axis of the whole animal D/V axis Planarian_Anatomy dorsal-ventral axis of whole organism PLANA:0007520 Axis that runs along the short axis of the animal, perpendicular to the anteroposterior axis, running from the dorsal (back) side of the animal to the ventral (belly) side of the animal. This axis splits anterior and posterior regions of the animal to either side. DV axis dorsal-ventral axis