trigonum cerebrale(n = noun.body) fornix - 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;
is a kind of fascicle, fasciculus, fiber bundle, fibre bundle
is a part of limbic brain, limbic system, visceral brain
has parts: carina fornicis