THE ANATOMY OF THE ELB:. 383 



the small sciatic notch, and joining the obturator internus tendon is inser- 

 ted along with it. 



Square Crural Muscle (Quadratus Femoris) is attached internally to the 

 Inferior border of the ischium, under cover of the posterior fibres of the 

 long vastus ; the fibres form a flattened band which passes transversely 

 outwards to be attached externally to a bony ridge on the shaft of the femur, 

 which is continuous with the posterior border of the great trochanter. 



Obturator Externus arises from the pubic bone external to the origins 

 of the adductor longus and pectineus, from the ischium behind the obtu- 

 rator foramen, and from the outer surface of the obturator membrane ; the 

 tendon of this muscle coalesces with that of the obturator internus, and is 

 inserted along with it. 



Pelvi-femoral 'Region. 



Psoas Magnus arises from the transverse processes and bodies of all 

 the lumbar as well as of the last two or three dorsal vertebrae, and before 

 passing out of the cavity of the pelvis unites with the iliacus, with which 

 its insertion is described. 



Iliacus arises from the external border of the ilium, as far back as the 

 acetabulum, and from nearly the whole of the iliac fossa. Its tendon 

 unites with that of the foregoing muscle, and the two are inserted together 

 into the small trochanter, and about an inch of the shaft of the femur below 

 that process. 



Psoas Parvus. — About half the size of the psoas magnus, lies internal 

 to that muscle, and arises from the bodies of the same vertebrae which 

 afibrd attachment to the latter. Its tendon is inserted into the ilio-pecti- 

 neal eminence, as well as to the adjoining portion of the ilio-pectineal line. 



Anterior Femoral Region. 



The Muscle of the Fascia Lata {Tensor Vagince) arises as a fleshy 

 bundle from the anterior extremity of the crest of the ilium, from about 

 two inches of the surface of the bone immediately behind the crest, and 

 also from the fascia covering the superficial gluteus ; the posterior fibres of 

 the muscle end in the fascia covering the outer side of the thigh, whilst the 

 anterior (which form the larger part of the muscle) run downwards to 

 join the extensor tendon of the knee. 



Long Adductor of the Leg {Sartorius) arises fleshy from the anterior 

 inferior spine of the ilium, by a tendon from the ilio-pectineal line, and from 

 the iliac fascia. The fibres form a ribbon-like muscle which lies in the in- 

 terval between the other adductors and the extensors. It is inserted into 

 the inner border of the ligamentum patellae and into the inner side of the 

 upper end of the tibia. Its insertion is united with the upper border 

 of the tendon of insertion of the gracilis. 



Vastus Externus. — This muscle arises from the anterior margin of the 

 great trochanter, from the upper half of the linea aspera, and from the 



