| OCR Text |
Show 70.] MYOLOGY OF CHAMELEON PARSONII. 879 The quadratus femoris (fig. 22, Q) arises from the postero-superior side of the tuberosity of the ischium, and is inserted into the summit of the head of the femur, above the great trochanter, but more in front (i. e. on the extensor aspect) of the femur. Obturator externus (fig. 21, O). This muscle arises from the outer surface of the ischium, and is conterminous with the quadratus femoris. It is inserted all along the great trochanter, on the inner side of the femoro-caudal. Fig. 22. 1>3 O.T. D2 Inner side of right half of pelvis. Gluteus secundus. 71,12, I*. Iliacus. 0.1. Obturator internus. Q. Quadratus femoris. Obturator internus (fig. 22, O. I). This muscle arises inside the pubis, conterminous with the inner margin of the origin of the third part of the iliacus. Passing downward (through the obturator foramen, and thus becoming superficial to the second part of the iliacus), it is inserted into the femur along its posterior side down to the summit of the insertion of the adductor. Rectus femoris (figs. 2, 4, 17, 18, 19, & 21, F\ F\ & F3). Three distinct muscular parts seem to belong to the category to which the rectus femoris of Mammals belongs. One of these parts seems to represent that which I have called rectus femoris in the Iguana*, and the other two parts to answer to what I have called gluteus maximus in the Iguanaf. The first part (F1) arises by a very strong tendon from the margin of the acetabulum. The second part (F2) springs from the anterior margin of the ilium, in common with the tendon of the internal oblique. The third part (F*) takes origin from the posterior margin of the ilium, between the origins of the gluteus primus and the ilio-peroneal. Passing downward these three parts unite with the deeper extensor muscles of the thigh. Vastus externus (figs. 2 & 17, V. E). This muscle arises from the lower half of the outer side of the femur. Distally it fuses with the other extensors. * P.Z.S. 1867, p. 701. t Ibid. |
