The two insects have complex flight mechanisms with major muscles in the thorax, the chest region, which power the flapping of wings.

这两种昆虫的飞行机理比较复杂，胸部长有较多肌肉，这样它们才能有力量振动翅膀。

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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.

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。

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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.

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。

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