Erections occur when signals from the brain cause the muscles of the penis to relax. If this does not happen, it can be due to MS Impotence or Multiple Sclerosis Impotence. When a flow of blood fills the chambers on the underside of the penis it results in erection. Erections that happen due to erotic situations use nerves that are at the base of the spinal cord and bypass the brain. However, erections due to erotic thoughts require processing by the brain. Signals pass from the brain down through the entire length of the spinal cord to the penis. This is important, as a person may achieve an erection on physical stimulation, but not on erotic thoughts, depending on the location in the brain or spinal cord where Multiple Sclerosis has occurred. MS Impotence or Multiple Sclerosis Impotence is not the first symptom of Multiple Sclerosis, but can show up …