Yes, the latissimus dorsi does attach to the scapula. Specifically, it connects to the inferior angle of the scapula, which is the lowest bony point of the shoulder blade. This is a standard anatomical attachment, not a rare variation, though it’s often overshadowed in anatomy textbooks by the muscle’s much larger origins along the spine and pelvis.
Where the Latissimus Dorsi Attaches
The latissimus dorsi is one of the broadest muscles in the body, and it has an unusually wide set of origin points. It attaches to the spinous processes of vertebrae from roughly T6 all the way down to S5 (mid-back to the base of the spine), connecting through both direct bony attachment and the thick thoracolumbar fascia. It also attaches to the posterior iliac crest (the back rim of the pelvis) and the lower three to four ribs, where its fibers interdigitate with the external oblique muscle of the abdomen.
Then there’s the scapular attachment: fibers originate from the inferior angle of the scapula. From all these origin points, the muscle fibers converge and travel upward and laterally toward the armpit, where they wind around the front of the teres major muscle and insert as a flat tendon into the intertubercular sulcus, a groove near the top of the upper arm bone. Interestingly, the fibers twist as they come together, so the highest fibers near the spine end up attaching to the lowest part of the groove, and the lower fibers attach higher up.
What the Scapular Attachment Does
The connection at the inferior angle of the scapula isn’t just a passive anchor. Research published in the Journal of Orthopaedic Surgery and Research found that the latissimus dorsi creates a dynamic track for the bottom of the scapula during arm movements. When you raise your arm out to the side, the muscle’s overlap with the scapula’s inferior border increases significantly. Because the other end of the muscle inserts on the upper arm bone, the position of this track shifts as your arm moves, effectively guiding the scapula through its range of motion.
This has real consequences for shoulder mechanics. A contracted or stiff latissimus dorsi presses the inferior border of the scapula forward against the ribcage, increasing what’s called posterior tilt of the shoulder blade. Studies show moderate-to-good relationships between latissimus dorsi stiffness and changes in scapular positioning, including increased upward rotation and posterior tilt, plus decreased internal rotation. In practical terms, this means the muscle helps stabilize the bottom edge of your shoulder blade against your chest wall during loaded movements like pull-ups, potentially preventing the scapula from winging outward.
How It Relates to the Teres Major
The scapular connection also places the latissimus dorsi right next to the teres major, a smaller muscle that originates from the back surface of the scapula near its lower edge. The latissimus dorsi runs along the inferior border of the teres major, and their tendons often merge near the point where they both insert on the upper arm bone. In some people, the tendons are fully fused before reaching the humerus. This close relationship means the two muscles frequently get injured together, particularly in throwing athletes and climbers who load both muscles heavily during overhead and pulling motions.
Anatomical Variations at the Scapula
While the inferior angle attachment is considered standard anatomy, the latissimus dorsi is known for producing variant slips of muscle tissue that connect to nearby structures. The most common variation is the axillary arch muscle, an extra band of tissue in the armpit area that appears in roughly 7% to 8% of people. Less commonly, variant fibers have been observed attaching to the coracoid process of the scapula (a bony projection on the front of the shoulder blade), the long head of the triceps, or nearby muscles like the coracobrachialis. The reported frequency of these variations ranges widely, from under 1% to over 37% depending on the population studied.
Why This Matters in Surgery
The scapular attachment becomes especially relevant during latissimus dorsi flap procedures, one of the most common reconstructive surgeries using this muscle. Surgeons harvest the latissimus dorsi (sometimes with overlying skin and fat) to reconstruct areas like the breast or head and neck after cancer surgery. When the flap needs to be rotated to reach distant sites, surgeons must detach the muscle from the humerus and carefully tie off blood vessel branches that run to the scapula. Skipping this step can cause the blood vessels feeding the flap to kink during rotation, which would cut off blood flow and cause the tissue to die. In more extensive reconstructions, surgeons may harvest what’s called a mega flap that includes not just the latissimus dorsi but also scapular bone, rib, and the neighboring serratus anterior muscle.