Which of the following muscles are considered large superficial muscles on the back?

The trapezius and latissimus dorsi are classified as large superficial muscles on the back due to their size, location, and function. The trapezius muscle covers a significant portion of the upper back and neck, shaping the contour of the back and playing a vital role in movements such as shoulder elevation and stabilization. It extends from the base of the skull down to the middle of the spine and out to the shoulder girdle.

Similarly, the latissimus dorsi is one of the largest muscles in the body and spans a majority of the back, originating from the lower spine and extending to the sides, contributing to the movement of the arms. This muscle is crucial for actions such as adduction, extension, and internal rotation of the shoulder joint. Together, these muscles provide not only structural support and shape to the back but also facilitate a wide range of upper body movements.

Other options do not consist of large superficial muscles located specifically on the back. The rectus abdominis and obliques are primarily abdominal muscles, while the deltoids and pectorals are located in the shoulder and chest regions, respectively. The rhomboids and supraspinatus are smaller muscle groups and lie deeper in the back, serving different