Erection viagra

Jump to navigation Jump to search This article is about penile erection. For the similar arousal erection viagra females, see clitoral erection. 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.

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An erection occurs when two tubular structures, called the corpora cavernosa, that run the length of the penis, become engorged with venous blood. The scrotum may, but not always, become tightened during erection. Generally, the foreskin automatically and gradually retracts, exposing the glans, though some men may have to manually retract their foreskin. In the presence of mechanical stimulation, erection is initiated by the parasympathetic division of the autonomic nervous system with minimal input from the central nervous system. After ejaculation or cessation of stimulation, erection usually subsides, but the time taken may vary depending on the length and thickness of the penis. The penis may erect during sleep or be erect on waking up. Erection is a common indicator of sexual arousal and is required for a male to effect vaginal penetration and sexual intercourse. Erections are common for children and infants, and even occur before birth. After reaching puberty, erections occur much more frequently. Spontaneous erection, also known as involuntary, random or unwanted erection, is commonplace and a normal part of male physiology.

Socially, such erections can be embarrassing if they happen in public or when undesired. Wikimedia Commons has media related to Erect human penis. Generally, the size of an erect penis is fixed throughout post-pubescent life. In regards to the average size of a human erect penis, a study of 15,521 men, and the best research to date on the topic, as the subjects were measured by health professionals, rather than self-measured, has concluded that the average length of an erect human penis is 13. Although many erect penises point upwards, it is common and normal for the erect penis to point nearly vertically upwards or nearly vertically downwards or even horizontally straight forward, all depending on the tension of the suspensory ligament that holds it in position. An erect penis can also take on a number of different shapes, ranging from a straight tube to a tube with a curvature up or down or to the left or right. The following table shows how common various erection angles are for a standing male. 90 degrees is horizontal and pointing straight forward, while 180 degrees would be pointing straight down to the feet. An upward pointing angle is most common. Erectile dysfunction occurs for a variety of reasons. Please see below and also refer to the separate entry on erectile dysfunction and the references therein.

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erection viagra

Erectile dysfunction can occur due to both physiological and psychological reasons, most of which are amenable to treatment. Priapism is a painful condition in which the penis does not return to its flaccid state, despite the absence of both physical and psychological stimulation. Priapism lasting over four hours is a medical emergency.

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