Table 4. The distances between the CST and the midline and the distances between the LC and the midline at the level of the vertebrae.

	CST-Midline (mm)			LC-Midline (mm)
Level	Left	Right	Mean	Left	Right	Mean
C3	26.7±2.6	26.5±2.7	26.6±2.7	4.0±0.6	4.1±0.6	4.0±0.6
C4	25.5±2.3	25.0±2.4	25.2±2.3	4.8±0.8	5.0±0.7	4.9±0.7
C5	24.1±2.1	23.5±2.0	23.8±2.1	5.9±0.9	6.0±0.7	5.9±0.8
C6	22.5±1.9	22.1±1.8	22.3±1.9	6.9±0.9	7.1±0.8	7.0±0.9
C7	20.8±1.6	20.4±1.5	20.6±1.6	7.8±0.8	8.0±0.8	7.9±0.8
T1		–		8.9±0.9	9.2±1.0	9.1±1.0
T2		–		10.5±1.3	10.6±1.2	10.6±1.3

CST: cervical sympathetic trunk; LC: longus colli. There was no statistical differences between two sides (P>0.05).