Of those listed, the least likely vertebra to exhibit spina bifida occulta is __________.

Question

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Spina bifida occulta is a birth defect in which the vertebrae of the spine do not close all the way during pregnancy. This can cause a gap in the spine, which can lead to nerve damage and other problems. The atlas (A) is the first vertebra in the spine, and it does not have a spinous process. The L5 vertebra (B) is the fifth lumbar vertebra, and it is the most common vertebra to exhibit spina bifida occulta. The T12 vertebra (C) is the twelfth thoracic vertebra, and it is less likely to exhibit spina bifida occulta than the L5 vertebra. The S1 vertebra (D) is the first sacral vertebra, and it is the least likely vertebra to exhibit spina bifida occulta.

Of Those Listed, the Least Likely Vertebra to Exhibit Spina