“…Brostrom compared MEPs recorded with needle and surface electrodes from levator ani muscle and striated urethral sphincter and did not found signi¢cant latency di¡erences; therefore, it will be di⁄cult to demonstrate the levator ani as a contaminator of surface electrode signals, as this would require a larger discrepancy between these two unique muscles [Brostrom et al, 2003a]. Furthermore, it has been shown, that the EUS is anatomically discontinuous with the surrounding pelvic £oor muscle [Gosling et al, 1981] and has its unique motor innervation mainly through branches of the pudendal nerve [Nordling and Meyho¡, 1979;Tanagho et al, 1982].…”