Anatomy
| Origin | Vertebral part: Spinous processes of vertebrae T7-T12, Thoracolumbar fascia Iliac part: Posterior third of crest of ilium Costal part: Ribs 9-12 Scapular part: Inferior angle of scapula |
| Insertion | Intertubercular sulcus of the humerus, between pectoralis major and teres major muscles Mnemonic: Lady between two majors (lady refers to latissimus dorsi) |
| Innervation | Thoracodorsal nerve (C6-C8) |
| Blood supply | Thoracodorsal artery, perforating arteries of the 9th-11th posterior intercostal arteries, and 1st-3rd lumbar arteries |
| Functions | Shoulder joint: Arm internal rotation, Arm adduction, Arm extension; Assists in respiration |
Bryson Ingram R.M.T. 