21. Identify the posterior trunk muscles described in Column A by choosing a response from Column B. Enter the correct letter in the answer blank. Select a different color for each muscle description with a coding circle and color the coding circles and corresponding muscles on Figure 6-8. Column A 1. Muscle that allows you to shrug your shoulders or extend your head 2. Muscle that adducts the shoulder and causes extension of the shoulder joint 3. Shoulder muscle that is the antagonist of the muscle just described 4. Prime mover of back extension; a deep composite muscle consisting of three columns 5. Large paired superficial muscle of the lower back 6. Fleshy muscle forming part of the posterior abdominal wall that helps maintain upright posture Column B A. Deltoid B. Erector spinae C. External oblique D. Gluteus maximus E. Latissimus dorsi F. Quadratus lumborum G. Trapezius
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