part_of adult leg adult tibia Fig. 4-20, with permission from the editor, Journal of Parasitology. TADS:0000281 TADS:0000281 The segment of the leg that articulates between the femur on the proximal side and the metatarsus on the distal side. Internal muscles from the femur enable the segment to flex and extend so that the leg can be flexed against the body for protection or extendedfor walking. default_namespace