subarachnoid

lukinkalvonalainen puhekieltä Located or occurring below the arachnoid mater, often specifically between the arachnoid membrane and the pia mater
{{quote-journal|date=May 20, 1988|author=Jack Clark|title=Touch of Death|work=Chicago Reader|url=https://securesite.chireader.com/cgi-bin/Archive/abridged2.bat?path=1988/880520/FNGRPRNT