What you see in this illustration is a very dominant right diaphragm leaflet that is working actively with the right quadratus lumborum muscle.  The illustrator has done a very good job in pulling out muscles of the lateral anterior wall of the abdominal pelvic cavity. These muscles including the diaphragm, quadratus lumborum and the left iliacus and psoas compliment what is going on in all human bodies.  This activity is kept in a “secret vault” (i.e. the abdominal pelvic cavity) and is something that is mysterious to many because we can’t palpate or visualize this on our patients.  Therefore, I like the word and I like the adjective describing this particular region of our body.  It’s a mysterious, secretive process that can be challenging for many of us to fully understand and appreciate.  The center of gravity is shifted over to the right side which is why the right thigh was kept on this particular image.  The right adductor magnus is a muscle that is allied with the above musculature listed.  It’s not a great picture that reflects the Left AIC musculature but it is a good picture that reflects the supportive or anti-gravitational muscle of a region that we can’t test or do research on.  It’s a great illustration, probably one of my favorites and it’s a good word that describes what I think eludes many of us in our teaching and basic reasoning on the influences of internal mechanisms that relate to the lateralization that we see in so many of our patients when they stand or walk.  We’ve spent so much time in our careers looking at the gluteus medius musculature, the abdominals and the quadriceps but we’ve done very little in discussing muscle that have greater impact and importance that we cannot actually observe or directly influence.  I believe PRI has a direct influence on the muscle in an indirect approach by understanding the normal mechanics of this asymmetrical view on typical asymmetrical patterns and positions that PRI therapists appreciate.