Parasympathetic branches extend from the sacral plexus into the arteries supplying the erectile tissue; upon stimulation, these nerve branches release acetylcholinewhich in turn causes release of nitric oxide from endothelial cells in the trabecular arteries. Having erection trouble from time to time isn't necessarily a cause for concern. An unusual aversion to the erect penis is sometimes referred to as phallophobia. Spontaneous erection, also known as involuntary, random or firm erect penis erection, is commonplace and a normal firm erect penis of male physiology. Erectile dysfunction dietary supplements Erectile dysfunction and diabetes Erectile dysfunction:
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Given the small amount of erectile tissue in a bull's penisthere is little enlargement after erection. Erection blood vessels - arteries, deep vein, cavernosal veins, para-arterial veins. Wikimedia Commons has media related to Erect human penis.
The following table shows how common various erection angles are for a firm erect penis male. The cortex may suppress erection, even in the presence of mechanical stimulation, as may other psychological, emotional, and environmental factors. Trost LW expert opinion.