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"Impotence," is also known as erectile
dysfunction (ED). ED is the repeated inability to get or keep
an erection firm enough for sexual intercourse. The word "impotence"
may also be used to describe other problems that interfere with
sexual intercourse and reproduction, such as lack of sexual desire
and problems with ejaculation or orgasm. Using the term erectile
dysfunction makes it clear that those other problems are not involved.
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.
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.
There are many factors resulting a reverse in erection. Depending
on the well being of the person, it may be due to several causes.
It can be due to stress or to certain physical conditions, emotional
or psychological factors and even poor health issues like high
cholestrol.
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