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Definition of S1-S5 (sacral vertebrae)

S1-S5 (sacral vertebrae): The first sacral vertebra through the fifth sacral vertebra.

There are 5 sacral vertebral bones. They are represented by the symbols S1 through S5.

The sacral vertebrae are situated in the spinal column just below the lumbar vertebrae and right above the coccyx, which is the lowest segment of the vertebral column. The sacral vertebrae are normally found fused together to form the sacrum.

Source: MedTerms™ Medical Dictionary
http://www.medicinenet.com/script/main/art.asp?articlekey=8788
Last Editorial Review: 6/14/2012

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