Further information on fly anatomy can be found via the Anatomical Atlas of Flies (from CSIRO, Australia).
Main parts of a fly
Head of a fly
Parts of the head
Bristles of the head
Thorax in top view
Thorax in side view
This wing has all the veins that were thought to be present in a primitive fly. No known fly has such complete venation, although some tipulids (craneflies) come close.
Reduced venation of a "higher fly"
Wing of Calliphora (Calliphoridae) showing the reduced venation typical of "higher" flies.
Parts of the legs
Orientation of bristles