INDIVIDUAL VARIATION.--In T.p. 3L,R (fig. 11B), an extra branch arises from the tibial nerve as a separate (fourth) division; it enters the medial head of M. flexor perforatus digiti IV and also gives off a twig that anastomoses with the posterior division (left leg) or with the first branch of the posterior division (right leg). In T.p. 3R (fig. 11B), a large extra branch arises from the proximal part of the medial division and passes medial and then deep to the medial head of M. flexor perforatus digiti III, perforates the tendinous part of the medial head of M. flexor perforatus digiti II, and joins the posterior division (lateral to the medial head of M. flexor perforatus digiti III). A similar branch is found in T.p. 3L except that it arises from the proximal part of the posterior (rather than the medial) division. In T.p. 3R (fig. 11B), the branch to M. gastrocnemius pars externa arises so far proximally that it appears as a separate (fifth) division of the tibial nerve. In two legs, the branch of the medial division that supplies M. gastrocnemius pars media sends a twig into the distal end of M. femorocruralis (fig. 11A). _T. cupido_ INDIVIDUAL VARIATION.--In one leg, an extra branch of the medial division arises immediately distal to the branch to M. gastrocnemius pars media and enters the proximal end of the medial head of M. flexor perforatus digiti III. In one instance, the branch to M. gastrocnemius pars interna passes through a gap in the origin of M. plantaris rather than distal to the origin of the latter. _P. p. jamesi_ INDIVIDUAL VARIATION.--The branch to M. gastrocnemius pars interna gives a minute twig to the deep surface of the free belly of M. plantaris in one leg. [Illustration: FIG. 2. Ventral views of the lumbosacral plexus of _Tympanuchus pallidicinctus_. Sympathetic ganglionated chain removed. Numbers indicate synsacral spinal nerves. × 2. A. T.p. 1L. B. T.p. 2L.] [Illustration: FIG. 3. Ventral views of the lumbosacral plexus. Sympathetic ganglionated chain removed. Numbers indicate synsacral spinal nerves. × 2. A. _Tympanuchus cupido pinnatus_ 3L. B. _Pedioecetes phasianellus jamesi_ 4L.] [Illustration: FIG. 4. Semidiagrammatic ventral views of the femoral nerve, showing the distribution of the branches. × 3. 1,2, M. extensor iliotibialis anticus; 3, cutaneous; 4-6, M. extensor iliotibialis lateralis; 7,8, M. iliacus; 9, M. gluteus profundus; 10-12, fused Mm. vastus lateralis and vastus medialis; 13,14, M. vastus medialis; 15, M. ambiens; 16, M. femoritibialis internus; 17, nonmuscular; 18, M. psoas; 19, M. iliotrochantericus medius. A. _Tympanuchus cupido pinnatus_ 3L. B. _Pedioecetes phasianellus jamesi_ 3L.]