A seizure is a burst of uncontrolled electrical activity between brain cells (also called neurons or nerve cells) that causes temporary abnormalities in muscle tone or movements (stiffness, twitching or limpness), behaviors, sensations or states of awareness. Horner's syndrome is distinguished from physiological anisocoria by instillation of a drop of 4% cocaine: in physiological anisocoria, this results in dilation, whereas it doesn't where there is a Horner's syndrome. Seizures are not all alike. A child with repeated absence seizures is said to have childhood absence epilepsy or petit mal epilepsy. Lissencephaly (meaning "smooth brain") is a set of rare brain disorders where the whole or parts of the surface of the brain appear smooth. Anencephaly is a condition that prevents the normal development of the brain and the bones of the skull. In people who have seizures, the brain's usual electrical activity is altered. Dysfunction or absence of this structure can result in a condition known as split-brain syndrome, in which each hemisphere of the brain functions independently. The septum pellucidum (SP) is a thin membrane located at the midline of the brain between the two cerebral hemispheres, or halves of the brain. Most often it starts between the ages of 4 and 15 years. Split-brain syndrome is associated with conditions such as alien-hand syndrome, which is characterized by involuntary and uncoordinated yet purposeful movement of the hands. The neural tube is a layer of cells that ultimately develops into the brain … It is caused by defective neuronal migration during the 12th to 24th weeks of gestation resulting in a lack of development of brain folds and grooves (). The absence of the septum pellucidum is a rare condition that affects the structure of the brain. Absence of facial sweating (anhidrosis). Enophthalmos. It is connected to the corpus callosum -- a collection of nerve fibers that connect the cerebral hemispheres. Specifically, a thin membrane called the septum pellucidum is missing from its normal position in the middle of the brain. Absence epilepsy can begin at any time during childhood. It contains 200 million nerve fibers that pass information back and forth. This condition results when a structure called the neural tube fails to close during the first few weeks of embryonic development. It is a type of neural tube defect (NTD). As the neural tube forms and closes, it helps form the baby’s brain and skull (upper part of the neural tube), spinal cord, and back bones (lower part of … New questions in Science. Anencephaly is a serious birth defect in which a baby is born without parts of the brain and skull. Epilepsy is a brain disorder that causes recurrent seizures if it is not treated. Heating coal in the absence of air is called destructive distillation. During an absence seizure, these electrical signals repeat themselves over and over in a three-second pattern. This condition results when a structure called the neural tube fails to close during the first few weeks of embryonic development. The neural tube is a layer of cells that ultimately develops into the brain … Name the term: the most malignant type of astrocytoma, composed of spongioblasts, astroblasts, and astrocytes; it usually occurs in the brain but may occur in the brain stem or spinal cord. The brain's nerve cells normally send electrical and chemical signals across the synapses that connect them. The corpus callosum is a structure that connects the right and left sides of the brain. 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