Protrusion of the membranes that cover the spine and part of the spinal cord through a bone defect in the vertebral column. MM is due to failure of closure during
embryonic life of bottom end of the neural tube, the structure which gives rise to the
central nervous system (the brain and spinal cord). The term spina bifida refers
specifically to the bony defect in the vertebral column through which the meningeal
membrane and cord may protrude (spina bifida cystica) or may not protrude so that the
defect remains hidden, covered by skin (spina bifida occulta). However, through usage the
term spina bifida is gradually becoming synonymous with MM. The risk of MM (and all neural
tube defects) can be decreased by the mother eating ample folic acid during pregnancy.
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