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Symptoms of erectile dysfunction The penis contains two chambers full of spongy tissue called the corpora cavernosa. When a man becomes sexually aroused impulses from the brain and local nerves cause muscles in the corpora cavernosa to relax, allowing blood to flow in and fill the spaces within the tissue. This creates pressure in the corpora cavernosa, making the penis expand. A membrane called the tunica albuginea helps trap the blood in the corpora cavernosa, thereby sustaining erection. The erection is lost when the muscles contract to stop blood flowing into the penis, and open outflow channels. A successful, sustained erection requires a sequence of events to occur in a precise fashion. Anything which disrupts this sequence can lead to problems either getting, or keeping an erection. Some men wake up with an erection or can achieve one with masturbation but not with a partner – this may indicate underlying psychological causes rather than physical disease.
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