Assertion: arachnoid | /r/CapableOf | extend down through the subarachnoid space
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Source sentences:
text: The arachnoid mater is named after the Greek word "Arachne" ("spider"), the suffix "-oid" ("in the image of"), and the Latin word "mater" ("mother"), because of the fine spider web-like appearance of the delicate fibres of the arachnoid (arachnoid trabeculae) which extend down through the subarachnoid space and attach to the pia mater.