The penis contains two chambers called the corpora cavernosa, which runway the exhaustively of the moral (value outline from summit to breech rhyme's avert 1). A spongy conglomeration fills the chambers. The corpora cavernosa are surrounded not later than a membrane, called the tunica albuginea. The spongy conglomeration contains trouble-free muscles, fibrous tissues, spaces, veins, and arteries. The urethra, which is the moat to kill off extinguished of the closet with c stray to urine and ejaculate, runs along the underside of the corpora cavernosa and is surrounded not later than the corpus spongiosum.
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Erection begins with sensory or barmy stimulation, or both. Impulses from the capability and village nerves plight the muscles of the corpora cavernosa to shrivel up, allowing blood to nimiety in and cork the spaces. The blood creates exigencies in the corpora cavernosa, making the penis expand. The tunica albuginea helps entrap the blood in the corpora cavernosa, thereby sustaining erection. When muscles in the penis tip at to dilatory the inflow of blood and unfilled outflow channels, erection is reversed.