Despite having a rather simple appearance, your penis actually is actually a very intricate, complex body part. Most people tend to think that since they know about the two major functions of the penis, there's nothing else worth learning about. This attitude, however, leaves out a few important factors that anyone who is interested in natural penis enlargement exercises should know about. The purpose of this article is to provide you with a comprehensive description of the structure of the penis and the individual organs is composed of.

On a very basic level, the human penis consists of two parts. The first one is the glans and is also often referred to as "the head". The second part is the shaft itself. Despite what some people suggest, the shaft is not a muscle. It is actually made up of three layers of tissue. One of these layers extends past the shaft and forms the glans itself.

•  Average penis size - studies and statistics

The first layer is called the Corpus Spongious and this is what makes up the underside of the penis and the glans. The second, Corpora Cavernosa, actually consists of two sections of tissue next to each other along the top of the shaft. The third and last major component of the penis is the urethra, which traverses the shaft and the glans from one end to the other. It has dual usage as it serves as a canal for both the urine and the sperm.

Erection of the penis is attained when the two tissue layers in the Corpora Cavernosa fill up with blood. At this point, it is important to note that humans have no erectile bone and erections are simply reliant on blood engorging the Corpora Cavernosa. Refer to the picture below for a visual explanation:

When sexual stimulation triggers an erection, the arteries that supply the penis with blood dilate, and therefore increase the blood inflow. The Corpora Cavernosa, a really spongy tissue, fills up with blood and the penis stiffens. As the Corpora Cavernosa stiffens, it also constrains the veins responsible for blood outflow from the penis and thus helps maintain the erection.

Despite each male being born with a complete set of reproductive organs, they are not fully developed until the time men enter puberty. During this period (which usually occurs between the ages of 10 and 14), the pituitary gland starts inducing the testicles to begin producing testosterone. This hormone is reponsible for many of the primary male psychological and physical traits.

These are some of the effects of testosterone on a human body: higher muscle mass, bigger bone structure, deeper voice and more intense hair growth. Most importantly, testosterone causes the increase in the size of the penis and testicles. As the puberty period winds down around the age of 18, the growth of the penis slows down before stopping altogether. The duration of the puberty varies and so does the age at which the penis stops growing.

•  The right way to measure your penis

Despite a popular misconception, penis size IS NOT linked to the size of any other body part. It is in no way related to the size of a man's feet, hands or nose. It is also not dependent on height. While some men are born with larger penises (for causes still unexplained by science), the main factor influencing penis size is testosterone levels during puberty.

While some of the latest studies have focused on the relationships between brain and penis size, to date there hasn't been any concusive scientific evidence linking the two.

Natural penis exercises are based on the anatomy of the penis. They focus on exerting pressure on the Corpora Cavernosa (the shaft) and aiding in the multiplication of the cells that make up this spongy tissue. The more blood the Corpora Cavernosa can hold, the bigger the size of the penis during the erection. A larger Corpora Cavernosa also causes an increase in the size of the penis in its flaccid state. Thus, consistent and sustained penis exercises are not only beneficial for the health of your penis, they are also an effective way to increase both girth and length of your manhood.

•  Next: How do penis exercises work?