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Puberty is the time when a boy's body becomes a man's body. It is a time of much physical and emotional growth. Hormones in the body are responsible for the changes in your body.


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Going to a Cleveland Clinic location? Blood trapped under high pressure creates an erection.

Ejaculation is a reflex action controlled by the central nervous system. Urology The penis is made up of:.

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When the blood vessels of the corpora cavernosa relax and open up, blood rushes in through the cavernosus arteries to fill them. The blood then gets trapped under high pressure, creating an erection.

Sexual stimulation and friction provide the impulses that are delivered to the spinal cord and into the brain. It is triggered when the sexual act reaches a critical level of excitement. It has two phases.

Cleveland Clinic is a non-profit academic medical center. Advertising on our site helps support our mission.

We do not endorse non-Cleveland Clinic products or services. Erection Ejaculation: How It Occurs When a male is aroused sexually, the blood vessels in the penis relax and open up, allowing blood to fill them. What is the anatomy of the penis?

The penis is made up of: Two chambers called the corpora cavernosa, which run the length of the organ and contain a maze of blood vessels shaped like cavernous spaces like a sponge. The urethra, or channel for urine and sperm, which runs along the underside of the corpora cavernosa. Erectile tissue, which surrounds the urethra, two main arteries and several veins and nerves. The shaft, the longest part of the penis.

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The head glanswhich is at the end of the shaft. The meatus, or opening at the tip of the head where urine and semen are discharged. How does an erection occur? An erection begins with sensory and mental stimulation.

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During sexual arousal, nerve messages begin to stimulate the penis. Impulses from the brain and local nerves cause the muscles of the corpora cavernosa to relax, allowing blood to flow in and fill the open spaces.

The blood creates pressure in the corpora cavernosa, making the penis expand and creating an erection. The tunica albuginea the membrane surrounding the corpora cavernosahelps to trap the blood in the corpora cavernosa, sustaining the erection. Erection is reversed when muscles in the penis contract, stopping the inflow of blood and opening outflow channels.

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How does ejaculation occur? In the first phase, the vas deferens the tubes that store and transport sperm from the testes contract to squeeze the sperm toward the base of the penis and the prostate gland and seminal vesicles release secretions to make semen. At this stage, the ejaculation is unstoppable. In the second phase, muscles at the base of penis contract every 0.

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When relaxed, the penis hangs at the front of the body.


Erections are a perfectly normal function of the male body , especially in guys who are going through puberty.