Studies on Sacral-Evoked Potentials

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Abstract
The bulbocavernosus reflex may be evoked electrically with a latency of approximately 35 ms in normal male [human] subjects. The sacral-evoked response was studied in 116 individuals, 10 of whom were normal controls. For each study, ipsilateral and contralateral responses were obtained from each side, resulting in 4 latency values. The abnormalities in 54 patients with a variety of documented neurologic lesions are described. The bulbocavernosus reflex has the characteristics of a cutaneous polysynaptic bilateral flexor response. The use of bilateral stimulation and recording techniques permits more effective localization of neurologic lesions involving the conus medullaris or cauda equina roots.