名詞 fornix:

1. generally any arch shaped structure (but often it refers to the arched roof of an anatomical space)
2. an arched bundle of white fibers at the base of the brain by which the hippocampus of each hemisphere projects to the contralateral hippocampus and to the thalamus and mamillary bodies
   同義詞：trigonum cerebrale

for.nix

n.（名詞）
【復數】 for.ni.ces[-n-sôz.]
An archlike anatomical structure or fold, such as the arched band of white matter located beneath the corpus callosum of the brain.
穹，穹?。阂环N弓狀或皺襞狀結構，如大腦胼胝體下面的白色的穹束狀的神經纖維束

來源：
Latin [arch, vault] * see g wher-
拉丁語 [拱門，拱頂] *參見 g wher-