Which muscles cover the upper back and help in the rotation of the shoulder blades?

The muscles that cover the upper back and assist in the rotation of the shoulder blades are the latissimus dorsi and trapezius. The trapezius is a large muscle that extends from the back of the head and neck down to the middle of the back and plays a significant role in the movement and stabilization of the shoulder blades (scapulae). It is involved in actions such as shrugging the shoulders and rotating the scapulae, which is essential for shoulder mobility.

The latissimus dorsi, located on the lower part of the back, contributes to arm movement and also plays a role in stabilizing and moving the shoulder blades. Its functions include enabling various arm actions as well as assisting in the retraction and downward rotation of the scapula.

Together, these muscles work to facilitate many upper body movements, providing support and enabling efficient shoulder mechanics during tasks such as lifting and reaching. Their anatomical positioning and coordinated actions make them vital for the proper functioning of the shoulder girdle and upper back.