The latissimus dorsi is an extrinsic muscle of the shoulder. Attachments: Originates from the spinous processes of T7-T12, iliac crest, thoracolumbar fascia and the inferior three ribs. The fibres converge into a tendon that attaches to the intertubercular sulcus of the humerus. Actions: Extension, adduction and medial rotation of the upper limb at the shoulder. Innervation: Thoracodorsal nerve. Blood supply: Thoracodoral artery. By TeachMeSeries Ltd (2025) Fig 1The superficial muscles of the back Pro Feature - 3D Model You've Discovered a Pro Feature Access our 3D Model Library Explore, cut, dissect, annotate and manipulate our 3D models to visualise anatomy in a dynamic, interactive way. Learn More Pro Feature - Dissection Images The superficial and intermediate muscles of the back The superficial and intermediate muscles of the back You've Discovered a Pro Feature Access our Dissection Image Library Enhance your understanding with high-resolution dissection images showcasing real-life anatomy. Learn More Print Article Rate This Article