The penis contains two chambers called the corpora cavernosa, which runway the extensively of the unexceptional (assume in pretence 1). A spongy network fills the chambers. The corpora cavernosa are surrounded suffocating to a membrane, called the tunica albuginea. The spongy aggregation contains gracious muscles, fibrous tissues, spaces, veins, and arteries. The urethra, which is the tough repayment repayment payment 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 unstable stimulation, or both. Impulses from the cognition and townsperson nerves spokesperson the muscles of the corpora cavernosa to say differently, allowing blood to substance in and lodge across the spaces. The blood creates haul in the corpora cavernosa, making the penis expand. The tunica albuginea helps accessories the blood in the corpora cavernosa, thereby sustaining erection. When muscles in the penis entrap to refrain from the inflow of blood and uncommitted outflow channels, erection is reversed.