Latissimus Dorsi - Podcast Version 0:00 / 0:00 1x 0.25x 0.5x 0.75x 1x 1.25x 1.5x 1.75x 2x 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 (2026) 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 Atlas 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 Frequent questions What is the latissimus dorsi muscle? The latissimus dorsi is an extrinsic muscle of the shoulder that plays a crucial role in upper limb movement. It is involved in actions such as extension, adduction, and medial rotation at the shoulder joint. Where does the latissimus dorsi muscle originate? The latissimus dorsi originates from several anatomical structures, including the spinous processes of T7-T12, the iliac crest, thoracolumbar fascia, and the inferior three ribs. These diverse attachments contribute to its extensive range of motion. What are the actions of the latissimus dorsi? The primary actions of the latissimus dorsi include extension, adduction, and medial rotation of the upper limb at the shoulder. These movements are essential for various activities, including reaching and pulling. How is the latissimus dorsi innervated? The latissimus dorsi is innervated by the thoracodorsal nerve. This nerve is vital for the muscle's function and motor control. What is the blood supply to the latissimus dorsi? The latissimus dorsi receives its blood supply from the thoracodorsal artery. This vascular supply is important for maintaining the muscle's health and function during physical activity. Rate This Article