#subarachnoid_space  a space in the meninges beneath the arachnoid membrane and above the pia mater that contains the cerebrospinal fluid
  supertype:  #space.amorphous_shape  an empty area (usually bounded in some way between things); "the architect left space in front of the building"; "they stopped at an open space in the jungle"; "the space between his teeth"
  part of:  #meninx__meninges  a membrane (one of 3) that envelops the brain and spinal cord

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