An erection involves the elaborate interaction of muscles, nerves, substances, and blood vessels that operate in coordination to engorge the penis with blood, together with: [six] Erection subsides when parasympathetic stimulation is discontinued; baseline stimulation within the sympathetic division of the autonomic anxious system causes constriction of the penile arteries https://angelohihgd.getblogs.net/68013766/the-basic-principles-of-penis