1. Located on the dorsum. For legs this means that these are considered as if they were in the position as given in the illustration. So, even if a leg is pointing upwards in a specimen, one should image that the leg was positioned in a horizontal plane, perpendicular to the body axis.
2. Located in a more position towards the dorsum. For example, a seta can be located dorsal to another seta.
Hint on the femur and tibia lines of tightly packed small setae often enable the dorsum (dorsal line) to be recognized and followed down the leg once the positional plane dorsal ventral is recognized in imagination.
See also comments on leg positional terminology under ventral.