INSERTION.--_Pars postica_: Several tendinous bands (intrapelvic) converge and coalesce, forming a single strong tendon that passes through the obturator foramen and attaches to the lateral surface of the femoral trochanter a short distance posterior to the insertion of M. gluteus profundus and proximal to the insertion of M. flexor ischiofemoralis. _Pars ventralis_: The attachment is fleshy and tendinous to the ventral edge and the deep surface of the tendon of pars postica. _Pars dorsalis_: The attachment is fleshy and tendinous to the dorsal edge of the tendon of pars postica. _Pars antica_: The attachment is fleshy to the posterior surface of the proximal end of the femur several mm. posterior to the insertion of pars postica; the lateral edge attaches to the obturator ridge. INNERVATION.--The muscle is supplied by the obturator nerve; several twigs, which do not pass through the obturator foramen, penetrate the anterior part of the medial surface of pars postica; several twigs pass through the obturator foramen and supply pars dorsalis, pars ventralis, and pars antica. INDIVIDUAL VARIATION.--In some cases the origin of pars postica does not include the dorsal end of the internal ilio-ischiatic crest nor the ilium posterior to it. Tiny but distinct accessory slips are sometimes present. In one leg a tendinous slip of pars antica extends beyond the remainder of the muscle and inserts independently on the trochanter close to the insertion of pars postica. In another leg, a fleshy and tendinous slip of pars antica attaches to the deep surface of the insertional tendon of pars postica. In still another leg, a fleshy and tendinous slip of pars dorsalis inserts adjacent (anterior) to the dorsal edge of the insertion of pars antica. _T. cupido_ INDIVIDUAL VARIATION.--The variations are similar to those given above for _T. pallidicinctus_ except that there is no slip of pars antica attaching to the tendon of pars postica. _P. p. jamesi._ INDIVIDUAL VARIATION.--There are variations similar to those given above for _T. pallidicinctus_ except that there is no independent slip of pars antica attaching on the trochanter close to the insertion of pars postica. Pars dorsalis may be quite small. In several legs, pars dorsalis is more closely associated with pars antica than with pars postica; in one of these, pars dorsalis is indistinguishably fused with pars antica (inserting with the latter) except for a few fibers which insert with pars postica. =_M. Femorocruralis_= (M. accessorius semitendinosi), Figs. 14, 15, 16, 17 Fisher (Fisher, 1946; Fisher and Goodman, 1955) considers this muscle as an accessory head of M. flexor cruris lateralis. The reasons for this change in terminology are given in the section on terminology. _T. pallidicinctus_