这个词是什么意思？
A delicate membrane enveloping the brain and spinal cord. It lies between the PIA MATER and the DURA MATER. It is separated from the pia mater by the subarachnoid cavity which is filled with CEREBROSPINAL FLUID.
中文名称索引；定义为 MeSH 英文原文，尚未逐条译审。MESH:D001099 · MeSH 2026。
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