Erection
GO:0043084, erection
Get notified whenever this star has news
Browse by day
Who is this?
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, sexual attraction or libido, although erections can also be spontaneous. The shape, angle, and direction of an erection vary considerably between humans. Physiologically, an erection is required for a male to effect penetration or sexual intercourse and 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. As an autonomic nervous system response, an erection may result from a variety of stimuli, including sexual stimulation and sexual arousal, and is therefore not entirely under conscious control. Erections during sleep or upon waking up are known as nocturnal penile tumescence (NPT), also known as "morning wood". Absence of nocturnal erection is commonly used to distinguish between physical and psychological causes of erectile dysfunction and impotence. The state of a penis which is partly, but not fully, erect is sometimes known as semi-erection (clinically: partial tumescence); a penis which is not erect is typically referred to as being flaccid, or soft.
What happened recently
What Age Do Men Stop Getting an Erection - View SNerB9mvb - Universidad Autónoma del Estado de Hidalgo
Erection Drug for Longevity? Soda and Stomach Cancer; Luigi Mangione Trial Postponed
Supplements That Will Give You an Erection: What Actually Works in 2026 - View 2mHdfS6UR - Universidad Autónoma del Estado de Hidalgo
Get Harder Erection Naturally - View R5kpbi8XT - Universidad Autónoma del Estado de Hidalgo
Erection at Home: Practical Supplement Approaches for Men's Vascular and Metabolic Health *FbLtj7Fv6* - Universidad Autónoma del Estado de Hidalgo
Understanding Erection Failure: Evidence-Based Ways to Support It Naturally - View i31cb68yQ - Universidad Autónoma del Estado de Hidalgo
Foods That Make a Harder Erection for Seniors - View z7u3TKV63 - Universidad Autónoma del Estado de Hidalgo
Loss of Erection: Understanding the Issue and Exploring Supportive Nutritional Options *X5cVpRD3r* - Universidad Autónoma del Estado de Hidalgo
Hard Time Keeping an Erection: What Evidence Shows and Real Ways to Support It *29Yg238Dv* - Universidad Autónoma del Estado de Hidalgo
Best Food for Hard Erection: Evidence-Based Choices That Support Vascular Health *Y8zGSKQcB* - Universidad Autónoma del Estado de Hidalgo
My Erection Doesn't Stay Hard: Practical Insights and Evidence-Based Steps *BNO5ULHNx* - Universidad Autónoma del Estado de Hidalgo
Chinese Herbs for Erection: What Actually Works in Practice - View vtB3dEIXc - Universidad Autónoma del Estado de Hidalgo
Management of Intraoperative Erection in Endourology: A Systematic Review of Techniques and Interventions
Cold showers, meditation, and other tips for getting rid of an unwanted erection
Anxiety can lead to erection problems in young men – but reaching for Viagra isn’t always the solution
'%2F%3E%3Ctext%20x%3D'100'%20y%3D'130'%20font-family%3D'-apple-system%2Csans-serif'%20font-size%3D'80'%20font-weight%3D'900'%20fill%3D'white'%20text-anchor%3D'middle'%3EY%C5%AA%3C%2Ftext%3E%3C%2Fsvg%3E){kind=small}
'%2F%3E%3Ctext%20x%3D'100'%20y%3D'130'%20font-family%3D'-apple-system%2Csans-serif'%20font-size%3D'80'%20font-weight%3D'900'%20fill%3D'white'%20text-anchor%3D'middle'%3ELU%3C%2Ftext%3E%3C%2Fsvg%3E){kind=small}
