这个词是什么意思？
The portion of the optic nerve seen in the fundus with the ophthalmoscope. It is formed by the meeting of all the retinal ganglion cell axons as they enter the optic nerve.
中文名称索引；定义为 MeSH 英文原文，尚未逐条译审。MESH:D009898 · MeSH 2026。
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