释义 |
neural tube defect in British English (ˈnjʊərəl tjuːb ˈdiːfɛkt) noun medicine a result of incomplete development of the structure in mammalian embryos that develops into the brain and spinal cord. Spina bifida in a newborn babies is an example of a neural-tube defect. neural tube defect in American EnglishnounPathology any of a group of congenital abnormalities involving the brain and spinal cord, including spina bifida and meningocele, causedby failure of the neural tube to close properly during embryonic development Examples of 'neural tube defect' in a sentenceneural tube defect The report said folic acid taken in the first three months of pregnancy did reduce the risk of neural tube defects, such as spina bifida.Medical wisdom has long held that taking folic acid supplements in pregnancy reduces the risk of neural tube defects, including spina bifida.Although the incidence of neural tube defects fell from the 1960s to the 1990s, it has since plateaued.Start taking 400 micrograms of folic acid every day to decrease the risk of neural-tube defects such as spina bifida.A lack of it can increase the risk of neural-tube defects, leading to spina bifida and hydrocephalus.That should cut the incidence of neural tube defects by between 11 and 18 per cent, or between 77 and 162 cases a year.There is very clear evidence that fortification will prevent approximately half of all neural tube defects. |