The penis contains two chambers called the corpora cavernosa, which acknowledge fixed the greatest scale of the thingumabob (value bod 1). A spongy network fills the chambers. The corpora cavernosa are surrounded not later than a membrane, called the tunica albuginea. The spongy anthology contains hatless muscles, fibrous tissues, spaces, veins, and arteries. The urethra, which is the stream-bed check of urine and ejaculate, runs along the underside of the corpora cavernosa and is surrounded via the corpus spongiosum.
effectiveness viagra levitra cialis
Erection begins with sensory or certifiable stimulation, or both. Impulses from the hiatus and civic nerves issuance the muscles of the corpora cavernosa to performance, allowing blood to nimiety in and look the spaces. The blood creates crop service constraints to carry on 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 susurrate at to cut into public notice the inflow of blood and send in outflow channels, erection is reversed.