part_of adult leg adult femur Fig. 4-20, with permission from the editor, Journal of Parasitology. TADS:0000280 TADS:0000280 The segment of the leg that articulates with the trochanter on the proximal side and the tibia on the distal side. Internal leg muscles from the trochanter enable the joint to flex and extend. In some species, the femur may appear to be divided into a basifemur and a telofemur but this is superficial since it is not reflected in the internal musculature. default_namespace