... Deep in the back of the abdomen, oneither side of the lumbar spine, lie the psoas muscles.They flex the hips. An abscess can develop in one of these muscles, usually when it spreads from the appen-dix, ... ed. St. Louis: Mosby, 1997. The GALE ENCYCLOPEDIA of Nursing &Allied Health GALE ENCYCLOPEDIA OF NURSING AND ALLIED HEALTH11OTHERBookallil, Michael. “pH of the blood: acid-base balance.”<http://www.usyd.edu.au/su/anaes/lectures/acidbase_mjb/frameversion.html>.Grogono, ... with another or with the outside. GALE ENCYCLOPEDIA OF NURSING AND ALLIED HEALTH7TreatmentSince skin is very resistant to the spread of infection,it acts as a barrier, often keeping the toxic...