inner sheath of optic nerve
the innermost sheath around the optic nerve, continuous with the leptomeninges (pia-arachnoid) and including a cerebrospinal fluid-filled intervaginal space, continuous with the subarachnoid space.
Synonym(s): vagina interna nervi opticiTA, internal sheath of optic nerve
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Examples: glitazone, GI cocktail, etc.