结论：前、中斜角肌在颈椎横突前、后结节均有起点，该交叉起点可能是上干型胸廓出口综合征的主要原因。

Conclusion:Anterior and middle scalene muscles have starting points in transverse processes of cervical vertebra. Those decussating starting points are the main cause of thorax exit syndrome.

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结果：前斜角肌起于第3 ~ 6颈椎横突的前后结节，中斜角肌起于第2 ~ 7或2 - 6颈椎横突的前后结节。

Results: Anterior scalene muscle originates from transverse processes of 3 ~ 6 cervical vertebrae. Middle scalene muscle starts from transverse processes of 2 ~ 7 or 2 ~ 6 cervical vertebrae.

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