346 MESSRS. MURIE AND MIVART ON THE (Apr. 11, 
inner side of the ascending ramus of the pubes, close to the ilium, 
and from the inner surface of the ilium as high as the ilio-pectineal 
line. It is inserted into the trochanteric fossa by a delicate tendon, 
with which the gemelli are closely connected (fig. 9, O. 7.). 
Fig. 9. Fig. 10. 
Fig. 9. Inner view of left half of the pelvis. 0.7. Obturator internus. 0. fer. 
Obturator tertius. P.c. Pubo-coceygeus. C. Coccygeus. G.i. Ge- 
mellus inferior. 4.m. Abductor magnus. 
Fig. 10. Right side of pelvis, seen in front. J. Iliacus. P.m. Psoas magnus. 
P. Pectineus. O. ter. Obturator tertius. O.e. Obturator externus. 
The obturator externus is thick and fleshy, having its usual origin 
and insertion (fig. 10, O. e.). 
Obturator tertius.—This very peculiar and anomalous muscle, of 
which we have not met with any record, arises from the inner surface 
of the ischium, close to its junction with the pubes, passing through 
the obturator foramen. It is inserted into the trochanteric fossa, in 
common with the obturator externus (figs. 9 & 10, O. ter.). 
The diceps is of extraordinarily large dimensions, and, arising by a 
strong tendon from the tuberosity of the ischium, and spreading out 
into a wide sheet of muscle, separates into two main divisions. The 
anterior of these overlaps the gluteus maximus, with which it is 
closely connected, and is inserted by strong tendinous fascia into the 
patella and outer head of the fibula. The posterior division of the 
biceps, which is more separated from the anterior division than is this 
last from the gluteus maximus, is inserted into the fascia of the leg 
along the outer border of the fibula (fig. 11, B.). Meckel*, in his 
description of this muscle, takes no notice of the anterior division, 
which he appears to have interpreted as part of the gluteus maximus. 
The semitendinosus has a double origin, as in the Horset, one 
* Loe. cit. p. 390. t Loe. cit. p. 383. 
