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How Does a Male Erection Occur?
The penis contains two chambers called the corpora cavernosa, which
run the length of the organ (see figure 1). A spongy tissue fills
the chambers. The corpora cavernosa are surrounded by a membrane,
called the tunica albuginea. The spongy tissue contains smooth
muscles, fibrous tissues, spaces, veins, and arteries. The urethra,
which is the channel for urine and ejaculate, runs along the
underside of the corpora cavernosa and is surrounded by the corpus
spongiosum.
A male erection begins with sensory or mental stimulation, or both.
Impulses from the brain and local nerves cause the muscles of the
corpora cavernosa to relax, allowing blood to flow in and fill the
spaces. The blood creates pressure in the corpora cavernosa, making
the penis expand. The tunica albuginea helps trap the blood in the
corpora cavernosa, thereby sustaining erection. When muscles in the
penis contract to stop the inflow of blood and open outflow
channels, erection is reversed
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Figure 1. Arteries (top) and
veins (bottom) penetrate the long, filled cavities running the
length of the penis--the corpora cavernosa and the corpous
sponglosum. A Male erection occurs when relaxed muscles allow the
corpora cavernosa to fill with excess blood fed by the arteries,
while drainage of blood through the veins is blocked. |
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 Studies Show Two
NaturalHerbs to Have a
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