Question

which structure needs to pass under the acromion and coracoacromial ligament during shoulder abduction? lesser tuberosity humeral head greater tuberosity glenoid fossa

Explanation:

During shoulder abduction, the greater tuberosity of the humerus must move beneath the acromion and coracoacromial ligament to allow full range of motion; impingement of this structure here is a common source of shoulder pain. The other structures do not pass under this ligamentous arch during this movement.

Answer:

Greater tuberosity