Ejaculation in men is a story of sweat and cheers. Nerves, blood vessels, tissues, and friction play important roles. Before we get into the story of the orgasm, let's quickly review the basic anatomy of the penis.
Running along the length of the penis are two cavernous (like a sponge) chambers, called the corpora cavernosa or the erectile tissues, containing a maze of blood vessels consisting of arteries, several veins, and nerves. The urethra, which runs along the underside of the corpora cavernosa, serves as the passageway for urine and ejaculate (sperm and semen). The longest part of the penis is the shaft, and at the end of the shaft is the head (glans penis) that is very sensitive. The opening at the tip of the head where urine and semen are discharged is called the meatus.
The story of the orgasm begins with sensory and mental stimulation in which the brain sends nerve messages to the penis in order to stimulate it and produce an erection. During sexual arousal, impulses from the brain and nerves in the penis cause the arterial muscles of the corpora cavernosa to relax, allowing blood to flow in and fill the open spaces. The blood creates pressure within the corpora cavernosa, making the penis expand, thereby creating an erection. The membrane surrounding the corpora cavernosa, the tunica albuginea, helps trap the blood in the corpora cavernosa, by occluding the venous outflow and sustain the erection. The erection is lost when arterial muscles in the penis contract after ejaculation, stopping the inflow of blood and opening outflow channels.
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