There are four =digital extensors=, two of which are fused with each
other and the peroneus tertius in the upper third of the leg.
1. The =anterior= or =long digital extensor= (M. extensor digitalis
longus) arises by the common tendon in the extensor fossa of the femur,
and separates from the other muscles near the middle of the leg. At the
distal end of the tibia it terminates on a tendon which passes down over
the hock (bound down by two annular ligaments) and ends like that of the
thoracic limb.
[Illustration: