35 



SURGICAL APPLIED ANATOMV. ICH&P. xvn. 



transvevsalis fascia. The quadratus lumborum will 

 be exposed in the posterior inch or so of the incision, 

 and usually does not need to be cut. At the seat of 



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

 Umbilicus. (After Braune.) 



o, Spine of the fourth lumbar vertebra ; 4, disc between third and fourth verte- 

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

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

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

 ureter. 



the operation the descending colon occupies the angle 

 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 

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



