👉 The seventh fluid, often referred to as cerebrospinal fluid (CSF), is a clear, colorless liquid that surrounds the brain and spinal cord in the central nervous system (CNS). Produced by the choroid plexus within the ventricles of the brain, CSF circulates through the ventricular system and bathes the brain and spinal cord, providing essential protection, nutrients, and waste removal. It helps maintain a stable environment by cushioning the brain from mechanical shocks, regulating intracranial pressure, and facilitating the removal of metabolic waste products. This fluid also plays a role in the immune response by transporting immune cells and antibodies to the CNS, protecting it from infections and other insults.
