x dorsal to y iff x is further along the dorso-ventral axis than y, towards the back. A dorso-ventral axis is an axis that extends through an organism from back (e.g. spinal column) to front (e.g. belly).

x dorsal_to y iff x is further along the dorso-ventral axis than y, towards the back. A dorso-ventral axis is an axis that bisects an organism from back (e.g. spinal column) to front (e.g. belly).