I'm gonna repeat what Webster 1913 and add a bit more on Meninges.

It has three membranes that surround the spinal chord and the brain:

Its functions are to protect the brain from injury:

Me*nin"ges (?), n. pl.; sing. Meninx (). [NL., fr. Gr. , , a membrane.] Anat.

The three membranes that envelop the brain and spinal cord; the pia mater, dura mater, and arachnoid membrane.

 

© Webster 1913.

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