Human seminal plasma, the fluid part of semen, is produced by contributions from the -
Prostate
Seminal vesicle
Bulbourethral gland
The prostate, bulbourethral glands and the seminal vesicles are accessory glands present at various intervals in the male reproductive tract. Sperm are bathed in the secretions of these glands known as seminal fluid. This fluid provides a medium for sperm to be motile as well as other factors that help sperm move through the female reproductive tract.