Origin：Spinous processes of inferior 6 thoracic vertebrae, thoracolumbar fascia, iliac crest, and inferior 3 or 4 ribs

 起點(diǎn)：下6個(gè)胸椎棘突，腰背筋膜，髂嵴，下3-4個(gè)肋骨

Insertion：Floor of intertubercular groove of humerus

 止點(diǎn)：肱骨結(jié)節(jié)間溝底

Action：Extends, adducts, and medially rotates humerus; raises body toward arms during climbing

 功能：伸展、 內(nèi)收、內(nèi)旋肱骨，攀爬時(shí)拉起肢體，并可輔助吸氣。

Innervation：Thoracodorsal nerve (C6, C7, and C8) (C6, C7, C8)

 神經(jīng)支配：胸背神經(jīng)

Arterial Supply：Thoracodorsal artery

血供：胸背動(dòng)脈