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 me 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 sj)ine, 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, G.), which is common to both muscles, 

 muscular fibres from each being inserted into it. 





Second layer of muscles of anterior surface of right tliigh. The gracilis is cut 

 away short above and reflected below. The rectus abdominis is hooked ou 

 one side to show the pyramidalis. 



A. Adductor magnus. G. Gracilis. G.Mx. Gluteus masimus. /. 1&2. Ilia- 

 cus and psoas. Pi/. Pyramidalis. li. Ecctus abdominis. B. F. Eeclus 

 femoris. S. Tibial adductor. & M. Semimembranosus. S. T. Semiten- 

 dinosus. T. I'r. 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 

 e.vteuding from the front of the acetabulum to the ischiatic sym- 



