Rostral Caudal whole body

The red bar indicates the direction of the rostral-caudal axis. In the trunk, caudal and inferior are synonymous, and rostral and superior mean the same thing. Thus the sacrum is caudal to the lumbar vetebrae. In the head however, the axis turns sharply, and caudal is no longer the same as inferior. In the head, rostral and anterior mean the same direction, and caudal means the same thing as posterior. The red arrowhead represents the rostral direction.