110 



of the diaphragm at the rear, as if the " trefoil " 

 stem were split in two. They then pass, the one 

 on the right, the other on the left of the upper ver- 

 tehrce of the loins, and are fixed, as they descend, to 

 those vertebrae which we should consider as form- 

 ing the upper C of the third S of the spine (§ 83). 

 From these vertebrae, as points d'appui, their ac- 

 tion gives a final stretching to the diaphragm, in 

 correspondence with the final inward bearing 

 which is given to the whole body by the action of 

 the secondary section of the posterior line, when, 

 in the bicomposite spine (§ 93), it accompanies the 

 motion of the condyle socket along the outer edge 

 of the head condyle. These muscles are called 

 the " Pillars of the Diaphragm.'' 



§ 107. The diaphragm supports the lower surface 

 of the lungs, and thus, from the double-twisting 

 action of the spine, which draws the diaphragm 

 flat, as well as extends the ribs, we have the chest 

 expanded in two directions, length and diameter. 



It is obvious that the above arrangement of the 

 diaphragm is fitted to act in two parts, a right and 

 a left. These conjoin their actions when the 

 ^' curves of superimposition " are in force.* 



* It may be added that, under the diaphragm lies, on the left side, 

 ithe stomach, on the right, the liver. Any habitual enlargement of 



