The male genitals are present in the body at birth, but they're not sexually active until adolescence. It is thought to clean the urethra before ejaculation and act as a lubricant during sex. This is the first secretion to pass down the urethra when a man becomes sexually excited. The tiny bulbourethral glands (shown in orange on the 3D image above) secrete a thick, clear mucus that drains into the urethra. These fluids provide the optimal environment for sperm to swim and survive in the acidic conditions of the female reproductive tract.Īt the last stage of ejaculation, semen passes into the urethra and out of the penis.ĭuring ejaculation, a man produces between two and five millilitres of semen that contains between 50 and 130 million sperm per millilitre. En route, fluids from the seminal vesicles (the small red glands at the end of the vas deferens shown in the 3D image above) and the prostate gland dilute the sperm. This carries sperm upwards, out of the scrotum, towards the penis. It provides nutrients to energise sperm and acts as a transport medium to carry sperm through the penis, out of the body and into a woman's vagina.ĭuring ejaculation, sperm are propelled from the epididymis along a duct called the vas deferens (the coat hanger-shaped duct shown in the 3D image above). Semen is a milky white, sticky mixture of sperm and fluid secretions. Sperm and urine both leave the body through a tube called the urethra that runs down the middle of the penis. An erection enables the penis to serve its role as the penetrating organ that delivers sperm into a woman's vagina. When a man is sexually aroused, this spongy tissue fills with blood, causing the penis to enlarge and become rigid. Most of the penis is composed of spongy erectile tissue.
#Diagrams of a penis skin
The penis is very sensitive and is partly covered by a loose fold of skin called the foreskin. Maturation takes between one and three weeks, after which they are either ejaculated out of the body or reabsorbed into the body.Įvery day a man makes between 50 and 500 million sperm. As sperm make their way through these tubes, they mature and learn to swim. Immature sperm pass out of the testes into the epididymes. This arrangement maintains sperm at a temperature slightly below body temperature, which is essential for the production of healthy sperm.Įach testis has a long highly coiled tube attached to it known as an epididymis. The testes lie in a sac called the scrotum that hangs outside the body, between the legs. Sperm and male sex hormones are made in two plum sized glands called the testes. Testes produce sperm and male sex hormones Physical description: Plum sized testes and expandable sausage-like penisįunction: To make and deliver sperm into a woman Location: Below the bladder and between the legs
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