• Persistent erection (priapism) is a painful, persistent, abnormal erection unaccompanied by sexual desire or excitation. It is most common in boys aged 5 to 10 years and in men aged 20 to 50 years. (See also Overview of Urinary Tract Symptoms.)
    The penis is composed of three cylindrical spaces (sinuses) of tissue through which blood can flow (called erectile tissue). The larger two sinuses, the corpora cavernosa, occur side by side. The third sinus (the corpus spongiosum) surrounds the urethra and ends as the cone-shaped end of the penis (glans penis). When these sinuses fill with blood, the penis becomes larger and rigid (erect). Muscles then tighten around the veins of the groin, preventing blood from flowing out of the penis and keeping the penis erect.


    Erection, persistent meaning & definition 1 of Erection, persistent.

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