| OCR Text |
Show 788 MR. ST. GEORGE MIVART ON THE [June 27, Quadratus lumborum. This muscle (fig. 3, Q. L.) is very thick at its origin, but thins out anteriorly. It arises from the crest and anterior part of the internal surface of the ilium, and is inserted into the transverse processes of the lumbar ribs, and also of all, or of almost all, the thoracic ones. Besides the short ribs, it is separated, in the lumbar region, from the superimposed dorsal extensor mass by a strong fascia. Gracilis. The muscle which appears to m e to represent, possibly, the gracilis of mammals is a superficial one on the antero-internal surface of the thigh (figs. 13, 14 & 15, G.). It arises from the ischi-atic symphysis, and from the long tendinous arch which passes from the front of the acetabulum, round behind the pubic spine, back to the symphysis just mentioned. It is inserted into the outer side of the upper part of the tibia, and at its insertion is intimately united with the semitendinosus. At the lower border of the insertion is a strongish tendon (fig. 14, C?.), which is common to both muscles, muscular fibres from each being inserted into it. Fig. 14. O.Mbe- 2t.F-\ TTJT. Second layer of muscles of anterior surface of right thigh. The gracilis is cut away short above and reflected below. The rectus abdominis is hooked on one side to show the pyramidalis. A. Adductor magnus. 67. Gracilis. G. Mx. Gluteus maximus. 7. 1 & 2. Iliacus and psoas. Py. Pyramidalis. S. Rectus abdominis. E. F. Rectus femoris. S. Tibial adductor. S. M. Semimembranosus. S. T. Semitendinosus. T.Pr. Transversus perinei. V.I. Vastus internus. The tibial adductor is a muscle which arises, beneath the gracilis, from about the' upper half of the tendinous arch just mentioned as extending from the front of the acetabulum to the ischiatic sym- |
