contained in overlaps overlaps material entity anterior-posterior axis whole organism anterior-posterior axis of the whole animal anterior-posterior axis Axis that runs along the long axis of the animal from anterior (head) to posterior (tail). It is perpendicular to the dorsoventral axis and as such, it splits dorsal and ventral regions of the animal to either side. main body axis anterior-posterior axis of whole organism PLANA:0007519 longitudinal axis body axis Planarian_Anatomy