Penis size and shape are
hereditary, and penises are as similar on the whole as they are infinite
in their variety. They are not muscles, and there's no bone in any of
them.
The penis is attached to the pelvic cavity at its root, or base. Its head, the big, smooth cap on the end, is called the glans, and the rim around the base of the glans is the corona. The shaft of the penis contains three columns of spongy erectile tissue, and is encased in a loose layer of skin. In uncircumcised men this skin also covers the glans. The piece of skin that keeps the glans covered is known as the foreskin, or prepuce, and it retracts as the penis becomes erect. Circumcised men have had the foreskin removed, so that the head of the penis is uncovered at all times. The slit in the head is the opening of the urethra, a slim tube that runs from the bladder through the body of the penis to the head. The urethra carries both urine and semen to the outside world, but not simultaneously.
The penis rests on the scrotum, which contains two testicles, or balls. Both testosterone and sperm are manufactured in the testicles. Penis and testicles grow to full size during puberty. From puberty onward, the sperm factory in the testicles maintains a constant production cycle. A healthy, fertile male makes several hundred million tiny sperm each day. His penis functions as a conveyor belt. Its erection is a sign he's getting ready to discharge some of those sperm, depositing them perhaps with a fellow human and in any case clearing his own storage facility for further stockpiling.
Source: The Book of the Penis by Maggie Paley
The penis is attached to the pelvic cavity at its root, or base. Its head, the big, smooth cap on the end, is called the glans, and the rim around the base of the glans is the corona. The shaft of the penis contains three columns of spongy erectile tissue, and is encased in a loose layer of skin. In uncircumcised men this skin also covers the glans. The piece of skin that keeps the glans covered is known as the foreskin, or prepuce, and it retracts as the penis becomes erect. Circumcised men have had the foreskin removed, so that the head of the penis is uncovered at all times. The slit in the head is the opening of the urethra, a slim tube that runs from the bladder through the body of the penis to the head. The urethra carries both urine and semen to the outside world, but not simultaneously.
The penis rests on the scrotum, which contains two testicles, or balls. Both testosterone and sperm are manufactured in the testicles. Penis and testicles grow to full size during puberty. From puberty onward, the sperm factory in the testicles maintains a constant production cycle. A healthy, fertile male makes several hundred million tiny sperm each day. His penis functions as a conveyor belt. Its erection is a sign he's getting ready to discharge some of those sperm, depositing them perhaps with a fellow human and in any case clearing his own storage facility for further stockpiling.
Source: The Book of the Penis by Maggie Paley
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