While carrying a heavy suitcase the downward dislocation of glenohumeral joint is resisted by the following muscles EXCEPT: (A) Deltoid, (B) Coracobrachialis, (C) Sho head of biceps, (D) Latissimus dorsi
Answer is D. The axis of pull of latissimus dorsi doesn't cross the shoulder joint and cannot have a shunt action on the joint. Shunt muscles - stabilise the corresponding joint, when not producing movement at the joint. For example, while carrying a heavy suitcase the downward dislocation of glenohumeral joint is resisted by the muscles like deltoid, coracobrachialis and sho head of biceps.