👉 The Todd fluid, also known as cerebrospinal fluid (CSF), is a clear, colorless liquid that circulates within the central nervous system (CNS) and acts as a vital cushion, providing nutrients and removing waste from the brain and spinal cord. It is produced primarily by the choroid plexus in the ventricles of the brain and flows through the subarachnoid space surrounding the spinal cord, eventually draining into the venous system. This fluid plays a crucial role in maintaining the homeostasis of the CNS, protecting neural tissues from mechanical injury, and facilitating the transport of essential substances.