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An erection clinically: penile erection or penile tumescence is a physiological phenomenon in which the penis becomes firm, engorged, and enlarged. Penile erection is the result of a complex interaction of psychological, neural, vascular, and endocrine factors, and is often associated with sexual arousal or sexual attraction , although erections can also be spontaneous. The shape, angle, and direction of an erection varies considerably in humans. Physiologically, erection is triggered by the parasympathetic division of the autonomic nervous system , causing the levels of nitric oxide a vasodilator to rise in the trabecular arteries and smooth muscle of the penis. The arteries dilate causing the corpora cavernosa of the penis and to a lesser extent the corpus spongiosum to fill with blood ; simultaneously the ischiocavernosus and bulbospongiosus muscles compress the veins of the corpora cavernosa restricting the egress and circulation of this blood. Erection subsides when parasympathetic activity reduces to baseline.
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How Does an Erection Occur?

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Flaccid and erect penis - Mayo Clinic

The penis contains two cylindrical, spongelike structures corpora cavernosa. During sexual arousal, nerve impulses increase blood flow to both of these cylinders. This sudden influx of blood causes an erection by expanding, straightening and stiffening the penis. Mayo Clinic does not endorse companies or products.
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12 Surprising Facts About Erections

Not that your boner should burn, BTW. Most of the time, the penis is flaccid and just hangs around minding its own business. During an erection, it becomes temporarily engorged with blood and enlarged. This makes it feel stiff and causes it to stand up and away from the body.
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Healthcare providers sometimes measure the firmness of your erections using the Erection Hardness Score. If you have any medical questions or concerns, please talk to your healthcare provider. The articles on Health Guide are underpinned by peer-reviewed research and information drawn from medical societies and governmental agencies. However, they are not a substitute for professional medical advice, diagnosis, or treatment. ED is really about how you and your partner feel about your sex life.
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