The function of the latissimus dorsi muscle is to assist in movement of the arms. This muscle spreads across the mid to lower back and is known as one of the widest muscles in the human body. It is a thin muscle and is utilized to move the upper body.
The lattisimus dorsi muscle is located in the back and allows both arms to move towards the chest in an adduction movement. This muscle also allows the arms to extend outward and move towards the back freely. It is also used when people walk and swing their arms from side to side.