Dura mater
（重定向自Pachymeninx）
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![Spinal reflections and folds.](/Images/godic/202502/01/Gray7670739.png")
Dura mater (UK /ˈdjʊərə ˈmeɪtər/ or US /ˈdʊərə ˈmætr/), or dura, is a thick membrane that is the outermost of the three layers of the meninges that surround the brain and spinal cord. It is derived from mesoderm.
The other two meningeal layers are the arachnoid mater and the pia mater. The dura surrounds the brain and the spinal cord and is responsible for keeping in the cerebrospinal fluid.