The greater and lesser tubercles are prominent landmarks on the proximal end of the humerus and serve as attachment sites for the four rotator cuff muscles of the glenohumeral joint.
The greater tubercle is lateral in position. Its superior surface and posterior surface are marked by three large smooth facets for muscle tendon attachments:
The superior facet is for attachment of the supraspinatus muscle.
The middle facet is for attachment of the infraspinatus.
The inferior facet is for attachment of the teres minor.