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Origin：Spinous processes of inferior 6 thoracic vertebrae, thoracolumbar fascia, iliac crest, and inferior 3 or 4 ribs 起点：下6个胸椎棘突，腰背筋膜，髂嵴，下3-4个肋骨 Insertion：Floor of intertubercular groove of humerus 止点：肱骨结节间沟底 Action：Extends, adducts, and medially rotates humerus; raises body toward arms during climbing 功能：伸展、 内收、内旋肱骨，攀爬时拉起肢体，并可辅助吸气。 Innervation：Thoracodorsal nerve (C6, C7, and C8) (C6, C7, C8) 神经支配：胸背神经 Arterial Supply：Thoracodorsal artery 血供：胸背动脉 |
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