这个词是什么意思？
Four CSF-filled (see CEREBROSPINAL FLUID) cavities within the cerebral hemispheres (LATERAL VENTRICLES), in the midline (THIRD VENTRICLE) and within the PONS and MEDULLA OBLONGATA (FOURTH VENTRICLE).
中文名称索引；定义为 MeSH 英文原文，尚未逐条译审。MESH:D002552 · MeSH 2026。
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