For·nix n.; pl. Fornices Anat. (a) An arch or fold; as, the fornix, or vault, of the cranium; the fornix, or reflection, of the conjuctiva. (b) Esp., two longitudinal bands of white nervous tissue beneath the lateral ventricles of the brain.
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fornix
n 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 [syn: trigonum cerebrale]
[also: fornices (pl)]