LATISSIMUS DORSI
| ORIGIN Spine T7, spinous processes and supraspinous ligaments of all lower thoracic, lumbar and sacral vertebrae, lumbar fascia, posterior third iliac crest, last four ribs (interdigitating with external oblique abdominis) and inferior angle of scapula |
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| INSERTION Floor of bicipital groove of humerus after spiraling around teres major |
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| ACTION Extends, adducts and medially rotates arm. Costal attachment helps with deep inspiration and forced expiration |
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| NERVE Thoracodorsal nerve (C6, 7, 8) (from posterior cord) |