|This image has been rotated 90 degrees clockwise from the one on the left and the spinodeltoid (5) has been
reflected to reveal the underlying muscles.
The small teres minor (4) arises from the caudal margin of the scapula. It inserts on the greater tubercle of the humerus just distal to the insertion of the infraspinatus (3). Together these two muscles rotate the humerus.
Also note how the lateral head of the triceps (7) passes under the spinodeltoid to insert along the deltoid ridge.