B. WAINWRIGHT, CUSTOM MEDICAL STOCK PHOTO / SCIENCE PHOTO LIBRARY B. WAINWRIGHT, CUSTOM MEDICAL STOCK PHOTO / SCIENCE PHOTO LIBRARY
Male urogenital system, vertical side section, illustration. The base of the spine is at upper right, with the rectum adjacent. At centre is the urinary bladder. The urethra (exiting the bladder) is the tube down which urine and semen are expelled from the body. Semen contains sperm, which is produced in the testes (grey, bottom), mixed with fluids from the seminal vesicles and the prostate gland (below bladder). The penis (lower left) is composed of erectile tissues (the corpus cavernosum, purple, and the corpus spongiosum, pink). These fill with blood on arousal, causing erection. The white area above the penis is the pubic bone.
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