A- Extend the shoulder (glenohumeral joint)Adduct the shoulder (G/H joint)Medially rotate the shoulder (G/H joint)O- Inferior angle of scapula, spinous processes of last six thoracicvertebrae, last three or four ribs, thoracolumbar fascia, andposterior iliac crestI- Intertubercular groove of the humerus The latissimus Dorsi is found superfically in the lower two thirds of the trunk, covering the serratu posterior muscles Latissimus Dorsi