The head or glans is at the end of the shaft. The opening at the tip of the head, where urine and semen come out, is called the meatus. Inside, two cylinder-shaped chambers called the corpora cavernosa run the length of the penis. They have a maze of blood vessels, tissue, and open pockets.
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The urethra, the tube that urine and semen flow through, runs along the underside of them, in the spongy tissue of the corpus spongiosum. Two main arteries one in each of the corpora cavernosa and several veins move blood in and out.
Nerves relay messages to and from other parts of your body. An erection starts in your brain. Something you saw, felt, smelled, heard, or thought makes your nerves send chemical messages to the blood vessels in your penis.
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The arteries relax and open up to let more blood to flow in; at the same time, the veins close up. The penis is quite rigid when non-erect, and becomes even more rigid during erection. Protrusion is not affected much by erection, but more by relaxation of the retractor penis muscle and straightening of the sigmoid flexure. A male fossa's penis reaches to between his forelegs when erect.
What Is an Erection?
The retractor muscle contracts to retract the penis into the sheath and relaxes to allow the penis to extend from the sheath. A bird penis is different in structure from mammal penises , being an erectile expansion of the cloacal wall and being erected by lymph , not blood. Clinically, erection is often known as "penile erection", and the state of being erect, and process of erection, are described as "tumescence" or "penile tumescence".
The term for the subsiding or cessation of an erection is " detumescence ". Colloquially and in slang , erection is known by many informal terms. Commonly encountered English terms include 'stiffy', 'hard-on', 'boner' and 'woody'. From Wikipedia, the free encyclopedia. This article is about penile erection.
For the similar arousal in females, see clitoral erection. For other uses, see Erection disambiguation.
How the Penis Works: Erection and Ejaculation
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erect | Definition of erect in English by Oxford Dictionaries
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This page was last edited on 26 August , at By using this site, you agree to the Terms of Use and Privacy Policy. Three columns of erectile tissue make up most of the volume of the penis.
Anatomical terminology [ edit on Wikidata ]. Wikimedia Commons has media related to Erect human penis.