316 SURGICAL APPLIED ANATOMY. [Chap. xvn. 



between the psoas and quadratus lumborum muscles, 

 and the non-peritoneal surface is exactly represented 

 by that part of the bowel that faces this angle 



G' a 



Fig. 32. Horizontal Section through the Body at the Level of the 



Umbilicus. (Ajter Braune.) 



a, Spine of the fourth lumbar vertebra ; 6, disc between third and fourth verte- 

 bne; c, umbilicus; d, quadratus lumborum; e, psoas ; /, external oblique, 

 with internal oblique and transversalis muscles beyond; g, rectus; h, de- 

 scending colon ; i, transverse colon ; j, aorta ; k, inferior vena cava ; I, ureter. 



(Fig. 32). Thus, if during the operation the curved 

 finger be placed in this angle, and the patient be 

 rolled over to the left side, the bowel that falls 

 into the finger cannot well be other than the descend- 

 ing colon. The gut is drawn forwards, stitched to 

 the wound, and opened by a transverse cut. The 



