Which muscle is commonly referred to as the broad muscle of the back and is located along the lower back?

• A. Pectoralis Major
• B. Latissimus dorsi
• C. Serratus Anterior
• D. Gluteus Maximus

Answer: (B)

Recognizing a back muscle by its broad, lower-back location helps you identify the latissimus dorsi, the broad muscle of the back. This large, flat muscle covers much of the lower back and rises toward the upper arm, giving the back its wide appearance. It powers pulling the arm down and toward the body (adduction), as well as shoulder extension and medial rotation. That combination of size, position, and actions is why it’s described as the broad muscle of the back. The other options aren’t in that region: the pectoralis major is a chest muscle, serratus anterior lies along the side of the ribs, and the gluteus maximus is in the buttocks.