What is deltoid tuberosity?

The deltoid tuberosity is a rounded projection located on the lateral aspect of the humerus bone. It serves as the attachment site for the deltoid muscle, one of the major muscles of the shoulder and upper arm.

The deltoid muscle originates from three different sites on the scapula and clavicle, and converges into a thick tendon that inserts onto the deltoid tuberosity of the humerus. This attachment allows the deltoid muscle to play a key role in shoulder abduction, flexion, and rotation.

In addition to serving as an attachment site for the deltoid muscle, the deltoid tuberosity also provides stability and support for the shoulder joint during movements that involve the deltoid muscle.

Overall, the deltoid tuberosity is an important anatomical feature that allows for the proper functioning of the shoulder joint and the muscles involved in shoulder movement.