the blank is the external male organ which allows the passage of the semen the skin covering of the testes which is a sac like structure is called blank one of the two pieces organs found beneath the prostate gland that neutralize the acidic urine in the urethra is the blank and the blank serves as passageway of the sperm cells released from the testes the blank service as a passage a passageway of both urine from the urinary bladder and semen from the glands scrotum aerotropolis glands cowper's vas deferens​