What type of fluid bathes the meninges and is produced in the brain's ventricles?

Cerebrospinal fluid is the type of fluid that bathes the meninges and is produced in the brain's ventricles. This clear, colorless fluid surrounds the brain and spinal cord, providing a protective cushion and serving several essential functions, such as maintaining intracranial pressure, supplying nutrients, and removing waste products. The production of cerebrospinal fluid occurs in the choroid plexus, which is found within the ventricles of the brain.

Synovial fluid, on the other hand, is a viscous fluid found in the joints that helps lubricate and reduce friction between the articular cartilages during movement. Interstitial fluid is the fluid that fills the spaces between cells in tissues, providing a medium for nutrient and waste exchange, but it does not specifically contact the meninges. Blood plasma is the liquid component of blood that carries cells and proteins throughout the body but also does not have a role in bathing the meninges. Therefore, cerebrospinal fluid is the correct answer as it directly relates to the central nervous system's protective mechanisms.