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Erection, accompanied by increases in the length and width of the penis, is achieved as a result of blood flow into the "erectile tissues" of the penis. These erectile tissues include two paired structures—the corpora cavernosa—located on the dorsal side of the penis, and one unpaired corpus spongiosum on the ventral. Seminal vesicle Ejaculatory duct Prostate.
The typical result is ejaculation of fluid that may contain sperm through strong muscle contractions. These fluids nourish and support the sperm so they can live after ejaculation for a limited time. This mixture of fluid and sperm, known as semen, is what is moved through the urethra and out the penis during orgasm.
Cancer treatment can interfere with ejaculation by damaging the nerves that control the prostate, seminal vesicles, and the opening to the bladder. It can also stop semen from being made in the prostate and seminal vesicles, or it can cut off the path that semen normally takes out of the body. Despite this, a man can still feel the sensation of pleasure that makes an orgasm. The difference is that, at the moment of orgasm, little or no semen comes out.
The male reproductive system consists of the penistestes, epididymisejaculatory ductsprostateand accessory glands. These organs function together to produce sperm and deliver semen from the testes via ejaculation. For more information on the embryological development of the male reproductive system, see development of the reproductive system.
The ejaculatory ducts ductus ejaculatorii are paired structures in male anatomy. During ejaculationsemen passes through the prostate gland, enters the urethra and exits the body via the urinary meatus. Ejaculation occurs in two stages, the emission stage and the expulsion stage.
Impulses traveling from the pudendal nerves reach the upper lumbar spinal sympathetic nuclei. Efferent signals traveling in the hypogastric nerve activate secretions and transport sperm from the distal epididymis, vasa deferentia, seminal vesicles, and prostate to the prostatic urethra. Coordinated closing of the internal urethral sphincter and relaxation of the external sphincter direct the semen into the bulbous urethra emission.
Just as age weakens your muscles and changes your eyesight, it can reduce both the strength and volume of your ejaculation. Every ejaculation releases semen from your body through your penis. The process happens in two stages:.
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.