The large muscle of the back is which?

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Prepare for the California Self‑Insurance Plans (SIP) Exam with our interactive quiz. Benefit from multiple-choice questions, detailed explanations, and essential tips to enhance your knowledge and succeed in your exam!

Multiple Choice

The large muscle of the back is which?

Explanation:
The large back muscle is the latissimus dorsi. It’s a broad, thick muscle that spans the lower back and flanks, extending from the spine and pelvis up to the humerus. This broad muscle accounts for the wide, wing-like contour of the back and has the greatest mass among back muscles. Its actions are powerful: it extends the arm, adducts it, and medially rotates the humerus, which you use in pulling, climbing, swimming, and rows. The other muscles listed are smaller and more targeted in function—trapezius dominates the upper back and neck region, while infraspinatus and rhomboid major are comparatively small muscles involved in scapular movement and stabilization.

The large back muscle is the latissimus dorsi. It’s a broad, thick muscle that spans the lower back and flanks, extending from the spine and pelvis up to the humerus. This broad muscle accounts for the wide, wing-like contour of the back and has the greatest mass among back muscles. Its actions are powerful: it extends the arm, adducts it, and medially rotates the humerus, which you use in pulling, climbing, swimming, and rows. The other muscles listed are smaller and more targeted in function—trapezius dominates the upper back and neck region, while infraspinatus and rhomboid major are comparatively small muscles involved in scapular movement and stabilization.

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