As we all know, the
penis is a cylindrical, flexible and pendant organ, which become larger and
harder when the male is sexually excited. This unique ability enables the male
to sexually couple with the female and transfer semen to the vagina.
The penis is made of three columns of
erectable tissue that are wrapped in connective tissue and covered with skin.
Also, the penis can be divided into three parts that are called the root, the
body (or shaft) and the glans penis. The root attachés the penis to the pubic
arch, and the body is visible pendent portion. Out of the said three columns of
tissue, the middle column that surrounds the urethra (the urine/semen tube)
expands at the end to form the glans penis. The urine tube opens at the tip of
the glans penis, and this opening is called the urethral orifice. A lose fold
of skin (called the foreskin or prepuce) covers the glans penis.
The testicles are a pair of oval-shaped
glands, which are contained in a pouch (a bag of skin), called the scrotum. The
Scrotum is divided by a membrane (a thin skin-like tissue) into two parts, each
half with one testicle. The scrotum is located behind the penis, suspending
from the root of the penis. This exposed location of the scrotum allows the
testicles to stay a few degrees cooler than the body temperature, which is the
ideal temperature for sperm production. The testicles produce the whitish sperm-bearing
fluid along with male sex hormones. Sperm are the male reproductive cells that
are able to fertilize female egg cells (ovum). Several hundred million sperm
are produce in the testicles each day. These sperm travel to a small tube
called the epididymis situated on the outer surface of the testicle and stay
there.
During sexual intercourse, the sperm move
out of the epididymis and travel through a tube called vas deferens (or called
ductus deference). This tube passes up from the epididymis towards the bladder,
and just beneath the bladder it joint with a duct from the seminal vesicle and
passes through the prostate gland produces a milky fluid and the seminal
vesicle adds nutrients such as fructose, vitamin C, and various amino acids.
The seminal fluid is the added to the sperm travelling in the vas deferens
making semen.
So, semen is the medium in which sperm leave
the body. Semen provides a water-like environment for the sperm to swim in and
also nutrients and protection for the sperm cells. The urethra is the duct in
which both urine and semen travel out of the penis. But these two flood fluids
do not mix because the prostrate gland closes the bladder during intercourse.
Finally, semen is forced out of the penis in short and rapid muscles spasms,
accompanied with an orgasm by the male. An average healthy male ejaculates
about three to five milliliters of semen, each ml containing around hundred
million sperm.