THE ERECT POSITION 



19 



oppose and balance one another. Thus, the foot affording 

 the surface of support, the muscles of the calf (Fig. 6, I) 



Pig. 6. — A DiAORAM FLLUSTRATINQ THE ATTACHMENTS OF SOME OF THE 



most important muscles whioh keep the bodt in the erect 



Posture. 



I. The muscles of the calf. II. Those of the back of the thigh. III. 

 Those of the spine. These tend to keep the body from falling forward. 



1. The muscles of the front of the leg. 2. Those of the front of the 

 thigh. 3. Those of the front of the abdomen. 4, b. Those of the front 

 of the neck. The.se tend to keep the body from falling backwards. The 

 arrows indicate the direction of action of the muscles, the foot being 

 fixed. 



c 2 



