Interstitial fluid flow travels throughout all the cells in the body. Here I co-author a review article describing Methods to Measure, Model, and Manipulate fluid flow in the brain

Chatterjee, Krishnashis, Cora M. Carman-Esparza, and Jennifer M. Munson. “Methods to measure, model and manipulate fluid flow in brain.” Journal of neuroscience methods 333 (2020): 108541.