Abdominal wall muscle weakness Beevor's sign 2015-12-21T23:16:45Z Weakness of the inferior portion of the rectus abdominal muscle, which is ascertained clinically as follows. When a patient sits up or raises the head from a recumbent position, the umbilicus is displaced toward the head. This is the result of paralysis of the inferior portion of the rectus abdominal muscle, so that the upper fibers predominate pulling upwards the umbilicus. Beevor's sign is said to be characteristic of a spinal cord lesion at the T10 level, but is also described inter alia in amyotrophic lateral sclerosis and in facioscapulohumeral muscular dystrophy. SNOMEDCT_US:61282003 UMLS:C0231616