top back testicle second part duct system vas deferens muscular tube begins lower end epididymis ref name referencea vas deferens passes upward along side testicles become part spermatic cord ref name referenceb ref expanded end ampulla stores sperm ejaculation third part duct system ejaculatory ducts long paired tubes pass prostate gland semen produced ref name referencea prostate gland solid chestnut shaped organ surrounds first part
Social science Sociology Sexology Human sexuality