Thoracodorsal nerve should be tested if we have difficulty moving latissimus dorsi.
Latissimus dorsi is help in rotational movemnt of shoulder joint such as abbduction,extension,internal rotaion,horizontal abduction.Therefore,it contributes in the movement of both thoracic and brachial arm motion.Rotation of the shoulder is possible due to attachment of latissimus dorsi on anterior humerus,teres major and pectoralis major for abdduction and medially to rotate humerus.
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