128 



HITCHCOCK'S 



ANATOMY 



253. Gluteus Muscle —A 

 Fig. 143. 



this muscle it is that the body is bent forward when the thigh 

 is fixed, and also by its means we keep the body erect when 

 in a sitting posture. 



movement in a direction oppo- 

 site to the last muscle, is ef- 

 fected by the contraction of 

 the Gluteus muscle. This 

 has its origin and insertion at 

 points directly opposite to 

 those of the psoas muscle — 

 and forms the nates or but- 

 tock. The fibers of this mus- 

 cle are the coarsest of any in 

 the whole body, showing that 

 they are designed for strength 

 and not celerity of motion. 

 Besides the movement already 

 mentioned, this muscle is of 

 great value when the leg is 

 made firm by keeping the 

 body in an upright position, 

 or raising the body upon the 

 thighs when it is bent forward. 



254. Muscles of the 

 Thigh.— The leg (Tibia) is 

 moved upon the thigh (Fe- 

 mur) by the conjoint action 

 of four muscles. These have 

 their origin about the head of 

 the femur, and the lower por- 

 tion of the innominatum, and 

 all unite into one tendon 

 which is inserted upon the 

 tubercle, or process of the 



A View of the Muscles on the Front of 

 the Thigh. 1, Crest of the Ilium. 2, Its 

 Anterior Superior Spinous Process. 3, 

 Gluteus Medius. 4, Tensor Vaginae Fe- 

 moris. 5, Sartorius. 6, Rectus Feinoris. 

 7, Vastus Externus. 8, Vastus Internus. 

 9, Patella. 10, Iliacus Internus. 11, Psoas 

 Magnus. 12, Pectineus. 13, Adductor 

 Longus. 14, Adductor Magnus. 15, Gra- 

 cilis. 



What movements are effected by it ? 253. What muscle produces motion in a con- 

 trary direction to the psoas muscle ? What is said of the size of the fibers of the Gluteus ? 

 254. How many muscles act to extend the tibia or the femur? 



