Movement - core: Deltoids.

Movement - core: Deltoids.

• A. Deltoids
• B. Latissimus Dorsi
• C. Hamstring Complex
• D. Pectoralis Major

Answer: (A)

The shoulder’s main mover for lifting the arm is the deltoid muscle group. Its fibers work together to raise the arm overhead and out to the side, with the different portions (front, middle, and rear) contributing depending on the direction of the movement. In common shoulder actions like lifting the arm or performing a press, the deltoids are the primary force driving the motion. The latissimus dorsi and pectoralis major can assist or stabilize, but they aren’t the main engines in these movements. The hamstring complex has no role in shoulder movement.

The shoulder’s main mover for lifting the arm is the deltoid muscle group. Its fibers work together to raise the arm overhead and out to the side, with the different portions (front, middle, and rear) contributing depending on the direction of the movement. In common shoulder actions like lifting the arm or performing a press, the deltoids are the primary force driving the motion. The latissimus dorsi and pectoralis major can assist or stabilize, but they aren’t the main engines in these movements. The hamstring complex has no role in shoulder movement.