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Children's Dictionary
amnesia partial or complete loss of memory as a result of an injury to the brain, illness, or shock.
brain the organ inside the skull of humans and animals. The brain is the main part of the central nervous system. It controls the body's movements and activities and is the center of thought, memory, and feelings. [1/3 definitions]
concussion an injury to the brain caused by a heavy blow, fall, or shock. [1/2 definitions]
depressed feeling continuously sad over a long period of time due to a condition within the brain. [1/3 definitions]
head the top or leading part of an animal body. In vertebrates the head contains the brain, eyes, nose, ears, and mouth. In invertebrates, the head contains eyes, mouth parts, and other organs. [1/10 definitions]
nerve any of the fibers that carry messages to and from the brain and other parts of the body. Nerves are bundled together into a complicated system that connects all parts of the body to the spinal cord and brain. [1/3 definitions]
pain physical hurt or discomfort that is usually caused by injury or illness. Pain is the nervous system's way of telling the brain that something is wrong. [1/5 definitions]
retina the part of the eye at the back of the inside of the eyeball. The retina has cells that sense light and color. Images are formed on the retina and sent to the brain.
sense organ a part of the body that takes in information and sends it to the brain. The eyes and the taste buds are sense organs.
skull the bony framework of the head and face that protects the brain.
spinal cord the thick cord of nerve tissue inside the spine that runs from the base of the brain to the end of the spine.
stroke a sudden sickness in the brain caused by the breaking or blocking of a blood vessel. A stroke can cause parts of the body to become numb. It can also cause death. [1/6 definitions]