Latissimus dorsi

origin: spinous processes of thoracic T7-L5, thoracolumbar fascia, iliac crest and inferior 3 or 4 ribs, inferior angle of scapula

insertion: floor of intertubercular groove of the humerus

artery: thoracodorsal branch of the subscapular artery

nerve: thoracodorsal nerve

action: adducts, extends and internally rotates arm