The chordate is the phylum with the most complex nervous system. The chordate has a brain and also has a spinal cord. A specific chordate is the fish. The fish, as in all vertebrates have a nervous system that coordinates its body activities. The central nervous system of the fish consists of a brain and a spinal cord. The fish has peripheral nervous system that has organs such as eyes, internal ears, taste glands, and other sensory organs that carry information to the brain or spinal cord. Information from the brain or spinal cord is carried to organs and body systems. It is sent for an appropriate response to the external or internal stimuli of the environment. The automatic nervous system is used to organize the activities of glansds, organs and is closely related to the brain. The brain of the fish is split up into sections that control different senses such as hearing, the sense of sight, and the sense of smell. Fishes can hear through the organs of hearing that are internal, located in the skull. These organs go to work when a sound wave directly hits the fishes on its bones, and fluids of the head and body. Fishes can see through a spherical lens in their eye that changes from far to near as they blink. Fishes taste through their tiny pitlike taste buds in their mouth. They have organs that are also located on their head and other body parts. This is how the fish carries out sensory information to its nervous system of the brain and spinal cord.