below the dura mater but above the arachnoid membrane of the meninges. 硬脑（脊）膜以下脑蛛网膜以上。
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。
