CSF flows from the 3rd ventricle through the cerebral aqueduct into the 4th ventricle. CSF is produced by the choroid plexus in the ventricles. CSF flows through the paired lateral apertures or the single medial aperture and into the central canal of the spinal cord. CSF flows into the arachnoid villi and drains into the dural venous sinuses. CSF flows through the subarachnoid space and removes waste products. Solution CSF flows from the 3rd ventricle through the cerebral aqueduct into the 4th ventricle. CSF is produced by the choroid plexus in the ventricles. CSF flows through the paired lateral apertures or the single medial aperture and into the central canal of the spinal cord. CSF flows into the arachnoid villi and drains into the dural venous sinuses. CSF flows through the subarachnoid space and removes waste products..