252 DETAILED SYNTHESIS. 



upon the lower part of the front margin of the pelvis, 

 and connect with the upper part (lesser trochanter) of 

 the thigh-bone (Femur). 



Remark. The Psoas are the only muscles that extend across the 

 Pelvis. With these exceptions, the Pelvis is the origin of motions both 

 upward and downward. It is the circle of support of all the upper parts 

 of the body and the portion of the body that walks upon the parts 

 below. It is the " dead point " in the body. 



529. THE USE OF THE ILLIAC AND PSOAS MUSCLES 

 is to bend the column and trunk forward upon the thigh- 

 bones, or to draw the leg up and turn it slightly. They 

 also essentially assist in maintaining the trunk erect on 

 the lower extremities. 



530. THE GLUTEI ARE very large strong muscles on 

 the back of the hip-bones, inserted by their lower ten- 

 dons in the thigh. They are the chief means for sup- 

 porting, in a backward direction, the trunk upon the 

 lower extremities. Several small muscles assist them. 



Muscles of the Lower Extremities. 



531. THE MUSCLES OF THE LOWER EXTREMITIES 

 may be classed as those that move the thigh on the hip ; 

 the lower leg on the thigh ; the foot on the leg ; and the 

 toes on the foot. 



632. Remark. THE MUSCLES THAT MOVE THE THIGH UPON THE HIP 

 are numerous : some already noticed are very large, but most are small. 



533. THE SARTORIUS (tailor's) extends from the up- 

 per front point of the hip diagonally down the thigh, 

 and is attached just below the inside of the knee to the 

 tibia. (Fig. 2, PI. 23.) 



534. THE USE OF THE SARTORIUS is to raise the 

 lower leg over the other, as when a tailor sits. This 

 muscle is very interesting from being the longest in the 

 Body, slender, graceful, with parallel fasciculi, prominent 



629. What is -? 530. What ? 581. How class -? 532. What said of 

 538. Describe -. 534. What is ? 



