The back muscles are divided into 2 groups - superficial and deep. superficial muscles are associated with movements of the shoulder and the deep muscles are associated with movements of the spine.

Back muscles:

1. Trapezius (Superficial)

2. Levator Scapulae (Deep)

3. Rhomboid major and minor (Deep)

4. Latissimus Dorsi (Superficial)

5. Erector Spinae (Deep)