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anal sphincter emg may also be useful in the evaluation of patients with multisystem atrophy (msa). 11, 12 patients with msa have degenerative changes in interomediolateral cell columns and onufs nucleus in the spinal cord, innervating both urethral and anal sphincters. Abnormal emg of the eas is strongly suggestive of an atypical parkinsonian syndrome such as msa. Anal sphincter emg in the diagnosis of parkinsonian syndromes. Anal sphincter emg in the diagnosis of parkinsonian syndromes. Anal sphincter electromyography (emg) and ano-rectal manometry are simple outpatient tests to assess whether the anal muscle (sphincter) and nerves are working correctly. The anal sphincter is the muscle valve at the opening of the rectum that controls bowel movements. External sphincter electromyography definition external sphincter electromyography helps physicians determine how well the external urinary sphincter muscle is working by measuring the electrical activity in it during contraction and relaxation. Purpose the external sphincter muscle is the ring-like muscle that controls urine release from the. emg of the anal sphincter in these cases reveals absent or markedly reduced voluntary activity. Reflexive contraction, if present, shows isolated high-frequency discharges of a few motor units. Complete damage to the sacral segment of the conus medullaris precludes sphincter response either voluntarily or reflexively.