Male reproductive anatomy.

Sperm is formed in the testis, and completes maturation in the epididymis.

Seminal fluid is produced in the seminal vesicle, prostate gland, and bulbourethral gland, and mix with sperm to produce semen.

During ejaculation, semen is expelled via the vas deferens to the urethra, which is also the exit duct for the urinary bladder.