RT Book, Section A1 Waxman, Stephen G. SR Print(0) ID 1171520919 T1 Ventricles and Coverings of the Brain T2 Clinical Neuroanatomy, 29e YR 2020 FD 2020 PB McGraw-Hill Education PP New York, NY SN 9781260452358 LK accessmedicine.mhmedical.com/content.aspx?aid=1171520919 RD 2024/10/14 AB Within the brain is a communicating system of cavities that are lined with ependyma and filled with cerebrospinal fluid (CSF): There are two lateral ventricles, the third ventricle (between the halves of the diencephalon), the cerebral aqueduct, and the fourth ventricle within the brain stem (Fig 11–1).