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powerful and important muscle employed ; and it seems to me that the 

 simultaneity of action of all parts of the leg, rendered necessary by 

 the employment of so powerful a muscle, is fully secured by the 

 interlacing of the tendons I have described, which renders it impos- 

 sible for one set of muscles to act without the others being also 

 exerted. 



The remaining muscles of the posterior limb are as follows : — 



14. M. glutceus'medius, 0-06 oz. 



Origin ; from the central part of the ilio- ischiadic surface. 

 Insertion ; its tendon passes over the great trochanter to be in- 

 serted into a line down the upper half of the outside of the 

 femur, between the origins of the two portions of the vastus 



externus. 



15. M. Gluteus minimus, 0*02 oz. 



Origin ; from the anterior point of the ilium. 



Insertion, into the inner side of the knee, under the fascia of the 

 rectus femoris. 



16. MM. vastus intemus, externus , et crurceus, 0*22 oz. 



The vastus externus consists of two distinct muscles, as in the 



Ostrich. 



17. M. psoas, ^ 0-57 oz. 



This large muscle takes an origin as high as the last rib, and is 

 inserted into the lesser trochanter, and the intertrochanteric 

 line leading to the outer side of the femur. It lies outside the 



iliacus, 



18. M. iliacus, 0-11 oz. 



Origin ; from the anterior transverse surface of the ilium, with a 



slip from the spine. 

 Insertion ; altogether into the lesser trochanter. 



19. M. sartorius, 0*04 oz. 



Origin ; behind the origin of the rectus, on the inner side, at the 



junction of the ilium and marsupial bone. 

 Insertion ; into the fascia of the inner side of the thigh, for two - 



thirds of its length. 



20. M. gracilis, 0-08 oz. 



Takes an origin from two heads — one at the posterior point of the 



pubis, and the other on the pectineal line. 

 Insertion ; into the head of the tibia by a tendon common to it with 



the semimembranosus. 



21. M. pectinmus, 0-06 oz. 



Origin ; between the two heads of gracilis, from the central part of 



the surface of the pubis and from the pectineal line. 

 Insertion, into the top of the linea aspera. 



22. MM. adductores, . . 0*21 oz. 



There are three adductor muscles : — 



1st Adductor, 0-13 oz. 



