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A multispeciality approach of impotent patients are necessary to establish the cause of impotence. Neurological history and examination are very important and must be completed by neurophysiological investigations. Bulbo-cavernosus reflex, conduction velocity of the dorsal nerve of penis and pudendal evoked potentials seems the most interesting tests. Urodynamics, perineal EMG, penile vibratory sensibility test can help determination of some peripheral neuropathies. Single potential analysis of cavernous electric activity may be useful in diagnosis of pudendal autonomic dysfunction.