Medical visualization of the male pelvic region with a flaccid penis also visible are the testicles, pelvis, femurs, and surrounding musculature. There are three columns of erectile tissue in the penis: at the top (or dorsal side) of the penis are the two corpora cavernosa, and at the bottom (or ventral side) is the corpus spongiosum. Upon arousal, the arteries that supply the penis dilate and allow blood to fill the three spongy erectile tissue columns, causing it to lengthen and stiffen. The engorged erectile tissue presses against penile veins, preventing blood from flowing back out of the penis.
Related content that may interest you:
Male Pelvis Showing Erect Penis, Male Pelvis Showing Flaccid Penis, Erect Penis Cross Section, Flaccid Penis Cross Section, Vasculature and Nerve Supply of Head of Penis, Male Pelvis Showing Partially Erect Penis, Vasculature and Nerve Supply of Head of Penis, Penis Cross Section Showing Erectile Tissue, Penis Transverse Section Revealing Erectile Tissue, Male Pelvis Showing Erect Penis 2, Septate Hymen within Female External Genitalia, Couple Having Sexual Intercourse