external sheath of optic nerveouter sheath of optic nervevagina externa nervi opticivagina externa nervus otici视神经: optic nerve; nervus opticus外: outside; external side鞘: whiplash视神经纤维鞘,视神经外鞘: fibrous sheath of optic nerve视神经外伤: optic nerve trauma下载手机词典可随时随地查词查翻译关注微信公众号：chachacidian，回复:视神经外鞘，即可在微信中查询翻译
