Out of the ordinary...out of this world. Hubble Heritage Gallery of Images. Planetarium - Interactive star map and virtual sky. World Sunlight Map. Brain Atlas - Introduction. The central nervous system (CNS) consists of the brain and the spinal cord, immersed in the cerebrospinal fluid (CSF).
Weighing about 3 pounds (1.4 kilograms), the brain consists of three main structures: the cerebrum, the cerebellum and the brainstem. Cerebrum - divided into two hemispheres (left and right), each consists of four lobes (frontal, parietal, occipital and temporal). The outer layer of the brain is known as the cerebral cortex or the ‘grey matter’. Brain Atlas - Introduction. Fisheries & Aquaculture - International Plan of Action For the Conservation and Management of Sharks. Sharks.