Nervous system of a generic bilaterian animal, in the form of a nerve cord with segmental enlargements, and a "brain" at the front Except for a few primitive organisms such as sponges (which have no nervous system) [14] and cnidarians (which have a diffuse nervous system consisting of a nerve net), [14] all living multicellular animals are bilaterians, meaning animals with a bilaterally ...
Brain, the mass of nerve tissue in the anterior end of an organism. The brain integrates sensory information and directs motor responses; in higher vertebrates it is also the center of learning. Learn more about the parts and functions of the brain in this article.
Your brain is an essential organ that regulates everything you do. It’s one of the two main parts of your central nervous system.
This fact sheet is a basic introduction to the human brain. It can help you understand how the healthy brain works, how to keep your brain healthy, and what happens when the brain doesn't work like it should.