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If you're seeing this message, it means we're having trouble loading external resources on our website. To log in and use all the features of Khan Academy, please enable JavaScript in your browser. Science Health and medicine Human anatomy and physiology Reproductive system introduction.

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Skip to search form Skip to main content. Video-clinical corners. Snoring, penile erection and loss of reflexive consciousness during REM sleep behavior disorder.

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The molecular and clinical understanding of erectile function continues to gain ground at a particularly fast rate. Intensive research has yielded many advances. The understanding of the nitric oxide pathway has aided not only in the molecular understanding of the tumescence but also aided greatly in the therapy of erectile dysfunction.

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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 attractionalthough erections can also be spontaneous. The shape, angle, and direction of an erection varies considerably in humans.

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For many men, getting an erection is as simple as breathing. But it's an incredibly complex process involving a precise sequence of psychological and physiological events that can easily go wrong. Here's how erections work — and how science is helping millions of men keep it up.

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From Wikimedia Commons, the free media repository. Media in category "Videos of penile erection" The following 14 files are in this category, out of 14 total. Animated erection process.

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About the Internal Penile Pump. Detailed Procedure Description. Urinary Incontinence Treatment.

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