Overview
- Researchers reporting in Nature Neuroscience found that tensing abdominal muscles in mice gently shifts the brain and can propel cerebrospinal fluid that bathes it.
- To prove cause, the team applied light, controlled pressure to anesthetized mice’s abdomens, which moved the brain and then let it return to baseline when the pressure stopped.
- The effect tracks to the vertebral venous plexus, a vein network linking the abdomen and spinal cavity that transmits pressure like a simple hydraulic system.
- Two-photon microscopy and microcomputed tomography captured brain shifts that coincided with abdominal tensing around voluntary movement.
- Computer models that treated the brain like a sponge showed how tiny displacements could help flush waste, though the authors stress that human relevance is still uncertain.