Normal semen consists of testicular fluid, epididymal fluid, urethral bulb gland fluid, paraurethral gland fluid, prostate fluid, and seminal vesicle fluid. These glandular fluids are expelled in a certain order during ejaculation. Before most of the semen is ejaculated, a small amount of fluid is secreted by the urethral bulbous and paraurethral glands. This is followed by a low-viscosity cream-colored fluid consisting of prostatic fluid and a small amount of sperm. The main part of the semen is a high-density sperm portion consisting of testicular, epididymal, vas deferens and some prostatic seminal vesicle fluid. The final part of the seminal fluid is composed of seminal vesicle fluid.