The angle of S1, S2, S3, S4 lateral to AB line is 63. 13 11. 65 , 71.24 11. 78 , 70.24 11.26 , 79. 69 16. 17 respectively.

• S_1、S_2、S_3、S_4神经与AB线的夹角分别为63.；13+11