1. below the dura mater but above the arachnoid membrane of the meninges. 
   硬脑（脊）膜以下脑蛛网膜以上。
2. anesthesia of the lower half of the body; caused by injury to the spinal cord or by injecting an anesthetic beneath the arachnoid membrane that surrounds the spinal cord. 
   下半身麻醉；由于向脊髓注入麻醉剂而导致。

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• 1. 蛛网膜绒毛
  arachnoid trabecula蛛网膜小梁...arachnoid villus蛛网膜绒毛...arched collecting tubule弓形集合小管
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