Optimizing your erectile tissue: the anatomy and function of the penile shaft

The penile shaft is an elongated, tubular structure that houses the erectile tissue of the male genitals. It extends from the base of the pubic bone to the tip of the glans penis and serves as the main support for the external reproductive organ. It is covered by a smooth, loose skin called the foreskin or prepuce, which can be retracted to reveal the glans penis during sexual activity. The average length of the penis varies greatly among individuals, with studies showing ranges between 2 and 10 inches. The width of the penis at its thickest point also varies considerably, with some men having a girthy penis while others have a thinner one. The size of the penis does not necessarily correlate with sexual performance or satisfaction. The three cylindrical bodies contained within the penile shaft are the corpora cavernosa and corpus spongiosum. The corpora cavernosa are two long columns of spongy tissue that run parallel to each other and contain many blood vessels, nerves, and connective tissue fibers. They become engorged with blood when a man becomes sexually aroused, leading to a stiffening of the penis known as an erection. Erections occur due to the release of nitric oxide, which causes the relaxation of the smooth muscle in the walls of the arteries supplying the corpora cavernosa. This allows increased blood flow into these structures, causing them to expand and fill with blood. At the same time, the veins that drain blood from the penis contract, preventing it from draining out. The corpus spongiosum is a thin layer of sponge-like tissue that surrounds the urethra, the channel through which urine and semen pass. It contains a small number of cavernous spaces that can trap blood, helping to maintain an erection even after ejaculation. The glans penis sits atop the corpus spongiosum and consists of a mushroom-shaped head surrounded by a ring of erectile tissue called the corona. During sexual activity, the corona and surrounding skin swell and become moist, increasing sensitivity and pleasure for both partners. In summary, the penile shaft houses three cylindrical bodies: the corpora cavernosa and corpus spongiosum. These structures play a crucial role in male sexual function by allowing for the development of an erection during arousal.