While carrying a heavy suitcase the downward dislocation of glenohumeral joint is resisted by the following muscles EXCEPT
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.
Deltoid
Coracobrachialis
Sho head of biceps
Latissimus dorsi
Upper limb bones and muscles (proximal region) & Scapular movements