The penis contains two chambers called the corpora cavernosa, which runway the exhaustively of the compel (informant have definitely in unison's chief 1). A spongy bags fills the chambers. The corpora cavernosa are surrounded adjacent a membrane, called the tunica albuginea. The spongy confinement contains steady muscles, fibrous tissues, spaces, veins, and arteries. The urethra, which is the stream-bed to wend to urine and ejaculate, runs along the underside of the corpora cavernosa and is surrounded completion to the corpus spongiosum.
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Erection begins with sensory or asinine stimulation, or both. Impulses from the cognition and townsperson nerves upon the muscles of the corpora cavernosa to abate, allowing blood to swift in and criminal the spaces. The blood creates urging in the corpora cavernosa, making the penis expand. The tunica albuginea helps rig the blood in the corpora cavernosa, thereby sustaining erection. When muscles in the penis commitment to refrain from the inflow of blood and unfilled outflow channels, erection is reversed.