Abdominal muscle deficiency syndrome
(Science: syndrome) congenital absence (partial or complete) of abdominal muscles, in which the outline of the intestines is visible through the protruding abdominal wall; in males, genitourinary anomalies (urinary tract dilation and cryptorchidism) are also found; genetics unclear.
To work the abdominal muscles you can do sit ups, crunches, and some pilaties exercises. Rectus Abdominus is the scientific Name for it and abs is the common Name. The rectus abdominus muscles flex the trunk if the muscles of the posterior trunk are relaxed. If not, contraction of these muscles increases the intra-abdominal cavity pressure, as in an action called the 'Valsalva maneuver'. Therefore, the recti have an important role during coughing, defecation, and childbirth.