👉 Descending fluid, also known as efferent fluid, refers to the movement of cerebrospinal fluid (CSF) away from the brain and spinal cord through a series of specialized channels and pathways. This process begins in the subarachnoid space, where CSF flows into the ventricles of the brain via the aqueduct of Sylvius and the cerebral aqueduct. From there, it moves through the foramina of Luschka and Magendie into the central canal of the spinal cord, where it exits through the spinal subarachnoid spaces and drains into the dural sinuses. These sinuses then channel the fluid towards the transverse sinus, sigmoid sinus, and ultimately into the venous system via the internal jugular veins. This continuous circulation is crucial for maintaining the homeostasis of the central nervous system, providing nutrients, removing waste products, and cushioning the brain and spinal cord.
