Which large flat muscle covers the lower back and helps attach the arms to the body?

The Latissimus Dorsi is the large flat muscle that covers the lower back and plays a crucial role in various movements of the arms and upper body. It is one of the largest muscles in the human body and extends from the lower vertebrae, the iliac crest of the pelvis, and the lower ribs to the humerus of the upper arm. Its primary functions include extending, adducting, and medially rotating the shoulder joint, which makes it essential for activities such as pulling and lifting.

This muscle is instrumental in providing support and stability to the torso, and it connects the upper body to the lower body. Its broad, flat shape also means it helps to form the contour of the back, giving it an important aesthetic and functional role in human anatomy.

In contrast, the other muscles listed are involved in different functions and areas. The Rhomboid muscles are positioned between the shoulder blades and assist in retracting the scapula, the Trapezius is a large muscle extending from the back of the head down to the middle of the back and primarily assists in movements of the head and shoulders, while the Serratus Anterior plays a key role in the movement of the scapula but does not cover the lower back. Thus