A roast beef sandwich on white bread is a deli classic. Usually made with beef from the round, or hind leg, section of the cow -- roast beef is one of the leaner cuts of beef with fewer calories than fattier sections. Video of the Day
corpus callosum. a great band of deeply situated transverse white fibers uniting the two halves of the cerebrum in humans and other mammals.
1. an archlike structure or the vaultlike space created by such a structure. 2. fornix of brain; either of a pair of arched fiber tracts that unite under the corpus callosum, so that together they comprise two columns, a body, and two crura. fornix. An archlike anatomical structure or fold, such as the arched band of white matter beneath the corpus callosum of the brain.