The cervical vertebrae are called the first cervical vertebrae to the seventh cervical vertebrae, the English word for cervical vertebrae is Cervical vertebrae, so the cervical vertebrae are abbreviated as C, the first cervical vertebrae are abbreviated as C1, and the seventh cervical vertebrae are abbreviated as C7. The lumbar vertebrae are five in total, called the first lumbar vertebrae to the fifth lumbar vertebrae, the English of the lumbar vertebrae is Lumbar vertebra, so the lumbar vertebrae are abbreviated as L, the first lumbar vertebrae are abbreviated as L1, and the fifth lumbar vertebrae are abbreviated as L5. Sacral vertebra, so it is abbreviated as S1, the first sacral vertebra is abbreviated as S1, and the fifth sacral vertebra is abbreviated as S5.