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.
The corpus callosum is the largest commissural pathway in the brain consisting of over 200 million nerve fibers. It allows for communication between the right and left hemispheres of the brain. The corpus callosum is the largest single structure in the brain. Agenesis=Absence or incomplete development of an organ or body part.