Final answer:
The lesser tubercle of the humerus is a large projection that provides attachment for the supraspinatus, infraspinatus, and teres minor muscles.
Step-by-step explanation:
The structure described in the question is the lesser tubercle of the humerus.
The lesser tubercle is a large projection located on the lateral side of the humeral head, forming part of the shoulder joint. It provides attachment for the supraspinatus, infraspinatus, and teres minor muscles.
These muscles are part of the rotator cuff, which is a group of muscles that stabilize and move the shoulder joint.