What is the name of the large triangular muscle located on the back?

The large triangular muscle located on the back is known as the trapezius. This muscle is significant because it extends from the base of the skull, down the back, and across the shoulders, forming a distinctive triangular shape. Its primary functions include the movement of the shoulders and the stabilization of the scapula, allowing for a range of upper body movements.

Anatomically, the trapezius is critical in activities involving the neck and upper back, supporting movements such as shrugging the shoulders, tilting, and turning the head, as well as lifting and pulling motions. Understanding the trapezius is essential in beauty therapy, particularly in treatments that involve massage or manipulation of the upper body, as knowledge of the muscle structure can enhance the effectiveness of techniques used.