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Because anencephaly is caused by abnormalities of the neural tube, it is classified as a neural tube defect. Because the neural tube fails to close properly, the developing brain and spinal cord are exposed to the amniotic fluid that surrounds the fetus in the womb.
Neural tube defects (NTDs) are birth defects. They affect a babyâs spine, spinal cord, or brain. Normally, a fetusâ neural tube develops into their brain, spinal cord, and spinal column. A NTD occurs if the tube doesnât fully form or close completely. The different kinds of neural tube defects are: Spina bifida. This is the most common NTD. It occurs in the base of the fetusâ spinal column. The opening allows part of the spinal cord to poke through the column. Spina bifida comes in several types. Anencephaly. It occurs in the upper part of the neural