Deltoid insertion?

Deltoid insertion?

• A. Greater tubercle
• B. Olecranon
• C. Lateral epicondyle
• D. Deltoid tuberosity

Answer: (D)

Deltoid insertion is on the deltoid tuberosity of the humerus. This rough, raised area on the lateral midshaft is where the deltoid tendon attaches, anchoring the muscle so its anterior, middle, and posterior fibers can lift and abduct the arm. The greater tubercle hosts insertions of the rotator cuff muscles, the olecranon is where the triceps inserts, and the lateral epicondyle serves as the attachment for various forearm extensors, not the deltoid.

Deltoid insertion is on the deltoid tuberosity of the humerus. This rough, raised area on the lateral midshaft is where the deltoid tendon attaches, anchoring the muscle so its anterior, middle, and posterior fibers can lift and abduct the arm. The greater tubercle hosts insertions of the rotator cuff muscles, the olecranon is where the triceps inserts, and the lateral epicondyle serves as the attachment for various forearm extensors, not the deltoid.