Latissimus Dorsi
Functionally, the latissimus dorsi muscle belongs to the muscles of the scapular motion. This muscle is able to pull the inferior angle of the scapula in various directions, producing movements on the shoulder joint (internal rotation, adduction, and extension of the arm).
When you injure your latissimus dorsi, you might feel pain in your lower back, mid-to-upper back, along the base of your scapula, or in the back of the shoulder. You may even feel pain along the inside of the arm, all the way down to your fingers.
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