THE MUSCLES AND FASCIA OF THE TRUNK 141 



lower six cartilages internal surface, back of ensi- 

 form; behind from the lumbar vertebrse by two slips 

 or crura; and from aponeurotic arches the arcuate 

 ligaments. The crura are found on the bodies of the 

 lumbar vertebra^ on each side of the aorta. The 

 internal arcuate ligament passes over the psoas muscle 

 from the outer side of the body of the first lumbar 

 vertebra to the lip of the transverse process. The 



FIG. 67 



Diaphragm, viewed from in front. (Testut.) 



external arcuate ligament passes over the quadratus 

 lumborum from the second transverse process to the 

 tip of the last rib. The fibers of the diaphragm arise 

 from these ligaments. The muscular fibers on reaching 

 the centre became fibrous, and form the central tendon 

 of the diaphragm. The fibers are interwoven in every 

 direction. The pericardium (the serous membrane 

 covering the heart) is attached to the upper surface 

 of this central tendon. 



