Trapezius and deltoid muscles suspend the upper limb from the vertebral column #anatomy

3-Second Blueprint (English)

1. Upper trapezius fibers run from the vertebrae to the clavicle and scapular spine, while the deltoid spans across to the humerus.
2. When carrying a heavy load, the deltoid actively holds the humeral head securely inside the glenohumeral shoulder joint.
3. Across the clavicle and scapula, upper trapezius transfers that tensile load back to the vertebral column as a suspension sling.