Table 1.

The cervical vertebrae reference points

No.	Point name	Description
1	SVp	The posterior point of the lower edge of the second vertebra
2	SVd	The deepest point of concavity at the lower edge of the second vertebra
3	SVa	The anterior point of the lower edge of the second vertebra
4	TVup	The posterior point of the upper edge of the third vertebra
5	TVum	The center point of the upper edge of the third vertebra
6	TVua	The anterior point of the upper edge of the third vertebra
7	TVpm	The posterior point of the center edge of the third vertebra
8	TVam	The anterior point of the center edge of the third vertebra
9	TVlp	The posterior point of the lower edge of the third vertebra
10	TVd	The deepest point of concavity at the lower edge of the third vertebra
11	TVla	The anterior point of the lower edge of the third vertebra
12	FVup	The posterior point of the upper edge of the fourth vertebra
13	FVum	The center point of the upper edge of the fourth vertebra
14	FVua	The anterior point of the upper edge of the fourth vertebra
15	FVpm	The center point of the posterior edge of the fourth vertebra
16	FVam	The center point of the anterior edge of the fourth vertebra
17	FVlp	The posterior point of the lower edge of the fourth vertebra
18	FVd	The deepest point of concavity at the lower edge of the fourth vertebra
19	FVla	The anterior point of the lower edge of the fourth vertebra