MUSCLES AND FASCIA OF LOWER EXTREMITY 161 



inserted into an impression on the front of the great 

 trochanter. 



Actions of the glutei on the lower limb: 



Flexion. 



Glut, med., anterior fibers. 

 Glut, min., anterior fibers. 



Adduction. 

 Glut, med., anterior fibers (in 



sitting posture. 

 Glut, min., anterior fibers (in 



sitting posture). 



Rotate in. 



Glut, med., anterior fibers. 

 Glut, min., anterior fibers. 



Extension. 

 Glut, maximus. 

 Glut, med., posterior fibers. 

 Glut, min., posterior fibers. 



Abduction. 

 Glut., max., slight. 



{strong, whole 

 muscle, espe- 

 cially mid- 

 portion. 



Rotate out. 

 Glut. max. 



Glut, med., posterior fibers. 

 Glut, min., posterior fibers. 



The glutens maximus extends the trunk on the thigh 

 as in ascending stairs; in walking it is not used, as the 

 erect position is maintained by ligaments; steadies 

 and supports the knee by the iliotibial band. 



The iliopsoas flexes the thigh and rotates out; flexes 

 the body on the thigh; the psoas bends the lumbar 

 spine forward and laterally. 



Psoas parvus makes tense the iliac fascia. 



The Thigh Muscles 



These are arranged in three sets anterior, poste- 

 rior, and internal, with superficial and deep layers, the 

 former passing over two joints, the latter over one. 



The Anterior Femoral Region. Tensor vaginae femoris 

 (tensor fascise) lies in a groove between the gluteus 

 medius, rectus, and sartorius. Origin, anterior part 

 of the external lip of the iliac crest, notch between 

 the two spines; insertion, between the two layers of 

 the fascia lata three or four inches below the great 

 trochanter, and from the insertion fibers are prolonged 

 into the iliotibial band, 

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