A membrane rich in blood vessels that lines the ventricles of the brain. It is an extension of the pia mater and secretes cerebrospinal fluid into the ventricles; it also controls exchange of materials between the blood and cerebrospinal fluid.
科学参考收录了60776条科技类词条，基本涵盖了常见科技类参考文献及英语词汇的翻译，是科学学习和研究的有利工具。