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The pectoralis minor is located underneath the pectoralis major. This thin triangle-shaped muscle runs up and down along the upper ribs. The major muscles in the upper torso include: 1  Trapezius: This muscle extends across the neck, shoulder, and back. 2  It allows for movement of the shoulders and shoulder blades.3  Rhomboid major: Attached to the shoulder blade, this muscle is one of many that aids shoulder movement.his thin triangle-shaped muscle runs up and down along the upper ribs. The major muscles in the upper torso include: 1  Trapezius: This muscle extends across the neck, shoulder, and back. 2  It allows for movement of the shoulders and shoulder blades.
Common Underlying Causes of Neck Lumps. An enlarged lymph node is the most common cause of a neck lump. Lymph nodes contain cells that help your body fight off infections and attack malignant cells (cancer). When youâre sick, your lymph nodes can become enlarged to help fight the infection. lump in the neck is also called a neck mass. Neck lumps or masses can be large and visible, or they can be very small. Most neck lumps are benign (noncancerous) and not harmful. But a neck lump can also be a sign of a serious condition, such as an infection or a cancerous growth.