Cerebral palsy is due to abnormal development or damage occurring to the developing brain. Interneurons connect neurons to other neurons within the brain and spinal cord. Neural networks were inspired by the architecture of neurons in the human brain. Sleep involves great changes in brain activity. Pneumococcal meningitis is an infection of the tissue covering the brain and spinal cord. The CNS consists of the brain and spinal cord. Symptoms are typically related to the brain and liver. Dilation of blood vessels around the brain may cause headaches. Carotid arteries supply blood to the brain and neck. Limbic encephalitis refers to inflammatory disease confined to the limbic system of the brain. EEG measures voltage fluctuations resulting from ionic current within the neurons of the brain. MRI of the brain is often normal. Is the human brain running a program? Changes in brain neurotransmitter activity have been found. Toxic effects include damage to the brain, kidneys and lungs.