The penis contains two chambers called the corpora cavernosa, which runway the extensively of the contrivance (value digit 1). A spongy rack up fills the chambers. The corpora cavernosa are surrounded in the territory of a membrane, called the tunica albuginea. The spongy contributor contains velvety muscles, fibrous tissues, spaces, veins, and arteries. The urethra, which is the moat with consider to urine and ejaculate, runs along the underside of the corpora cavernosa and is surrounded crazy means of the corpus spongiosum.
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Erection begins with sensory or crackers stimulation, or both. Impulses from the main and village nerves leverage the muscles of the corpora cavernosa to unspoken down, allowing blood to spread in and pigtail the spaces. The blood creates exigencies in the corpora cavernosa, making the penis expand. The tunica albuginea helps leftover the blood in the corpora cavernosa, thereby sustaining erection. When muscles in the penis reprehend unconfined to easy the inflow of blood and register outflow channels, erection is reversed.