Individual Variation.—In three legs the nerve supplying M. extensor iliotibialis anticus gives twigs into M. extensor iliotibialis lateralis. In another leg one of the branches to the fused Mm. vastus lateralis and vastus medialis sends a twig into M. extensor iliotibialis lateralis.
Fig. 17. Tympanuchus pallidicinctus 2L. Lateral view of the muscles of the left leg. The following muscles, in addition to those listed for [Fig. 16], have been removed: vastus lateralis pars postica, gluteus profundus, flexor cruris medialis (in part), caudofemoralis, flexor perforatus digiti IV, and tibialis anticus. × 1.
P. p. jamesi