name the three protective members covering the brain
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- Mᴇɴɪɴɢᴇs ᴀʀᴇ ғᴏʀᴍᴇᴅ ʙʏ ᴛʜʀᴇᴇ ᴛɪssᴜᴇ ᴍᴇᴍʙʀᴀɴᴇs ᴛʜᴀᴛ ᴀʀᴇ ᴘʀɪᴍᴀʀɪʟʏ ᴋɴᴏᴡɴ ᴀs ᴡʀᴀᴘᴘᴇʀs ᴏғ ᴛʜᴇ ʙʀᴀɪɴ. Tʜᴇʏ ᴄᴏɴsɪsᴛ ᴏғ ᴅᴜʀᴀ ᴍᴀᴛᴇʀ, ᴀʀᴀᴄʜɴᴏɪᴅ ᴀɴᴅ ᴘɪᴀ ᴍᴀᴛᴇʀ. Tʜᴇ ᴅᴜʀᴀ ᴍᴀᴛᴇʀ ᴏʀ ᴘᴀᴄʜʏᴍᴇɴɪɴx (ᴘᴀᴄʜʏ-ᴛʜɪᴄᴋ) ɪs ᴛʜᴇ ᴏᴜᴛᴇʀ ᴍᴇᴍʙʀᴀɴᴇ ᴀɴᴅ ғᴏʀᴍs ᴀ sᴀᴄ ᴛʜᴀᴛ ᴇɴᴠᴇʟᴏᴘs ᴛʜᴇ ᴏᴛʜᴇʀ ᴍᴇɴɪɴɢᴇᴀʟ ʟᴀʏᴇʀs.
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Meninges are formed by three tissue membranes that are primarily known as wrappers of the brain. They consist of dura mater, arachnoid and pia mater. The dura mater or pachymeninx (pachy-thick) is the outer membrane and forms a sac that envelops the other meningeal layers.
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