Mouse Nasal Cavity (IMAGE) Penn State Caption Schematic of the mid-sagittal plane of the mouse skull and brain. The pathway of cerebrospinal fluid flow is shown by blue arrows, flowing around the brain and spinal cord. Cerebrospinal fluid drains from the brain and into the nasal cavity through a bony plate known as the cribriform plate. Credit Patrick Drew, Penn State Usage Restrictions non commercial use only License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.