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Noun, pl. leptomeninges

1. A term used to refer to the pia mater and arachnoid mater, two of the membranes that surround the brain and the spinal cord. (

2. The innermost layers of the meninges; the pia mater and the arachnoid. (

3. The two innermost layers of the meninges; cerebrospinal fluid circulates between these innermost layers. (

4. Literally, thin meninges.

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