The penis is a man’s reproductive and sex organ. It is formed of three columns of spongy tissue — the corpus spongiosum and two corpora cavernosa — that fill with blood during sexual excitement, causing an erection (“hard on”). The penis extends from the lower portion of the belly. It is made up of a shaft and a glans (also known as the head) and is very sensitive to the touch. A man’s urethra is enclosed in his penis. It carries urine, pre-ejaculate, and semen out of his body.
The shaft looks like a tube. The shaft of the penis is about 1–3 inches long when soft. During an erection, the shaft expands to generally reach 4–6 inches.
The glans is the soft and highly sensitive part of the penis, located at its tip.Foreskin
The foreskin is a retractable tube of skin that covers and protects the head (glans). Some men have had their foreskin removed by circumcision during infancy. Some choose to be circumcised later in life.Scrotum
The scrotum is a sack of skin divided into two parts, enclosing the internal reproductive organs — the testicles.
Testicles have 2 main functions:
The frenulum is where the foreskin attaches to the underside of the penis just below the glans. Usually, a portion of it remains after circumcision.
- Opening of the Urethra
The opening of the urethra is located at the tip of the penis. This is where pre-ejaculate, semen, and urine leave the body.
- They make male hormones (androgen’s) such as testosterone.
- They make sperm, the male cells needed to fertilize a female egg cell to start a pregnancy.During ejaculation, sperm cells are carried from the epididymis through the vas deferens to seminal vesicles, where they mix with fluids made by the vesicles, prostate gland, and other glands to form semen. This fluid then enters the urethra, the tube in the center of the penis through which both urine and semen leave the body.The information above has been adapted from:
- Sperm cells are made in long, thread-like tubes inside the testicles called seminiferous tubules. They are then stored in a small coiled tube behind each testicle called the epididymis, where they mature.