humerus
=ANSWER:==The deltoid is not a bone but a muscle in your shoulder.=
Deltoid tuberosity
Deltoid muscles help to move the shoulders.
agonists
The primary muscle attached at the point of insertion is the muscle that undergoes the most movement when the muscle contracts. For example, in the bicep curl exercise, the bicep muscle is the primary muscle attached at its point of insertion on the radius bone in the forearm.
The deltoid muscle helps to prevent the dislocation of the long bone in the upper arm. The blood supply to the deltoid is through the posterior circumflex humeral artery.
The deltoid is very interesting muscle. It arise from the outer and lateral border of the clavicle and outer and lateral border of the spine of the scapula. From the corresponding inner border, you have insertion of the trapezius muscle. The deltoid muscle is inserted on the deltoid tuberosity on the lateral and middle part of the humerus bone. So it looks that the trapezius muscle continue as the deltoid muscle.
ball and socket joints
deltoid, pectoralis, trapz
The deltoid rotation helps the shoulder joint move in different directions, allowing for a wide range of motion.
It is a triangular muscle covering the shoulder joint, it raises the arm from the side of the body
The muscle adjacent to the deltoid is the supraspinatus, which is part of the rotator cuff. The supraspinatus is located above the scapula and assists in shoulder abduction, particularly in the initial phase. It works in conjunction with the deltoid to stabilize and move the shoulder joint.