Question

Where does the Deltoid originate and insert? And what is its action?

Answer 1

The deltoid muscle originates on the lateral third of the clavicle, the acromion process of the scapula, and the spine of the scapula. It inserts on the deltoid tuberosity of the humerus. The deltoid muscle is responsible for abducting the arm, as well as flexing and medially rotating it, and extending and laterally rotating it.

Step-by-step explanation:

The deltoid muscle originates on the lateral third of the clavicle, the acromion process of the scapula, and the spine of the scapula. It inserts on the deltoid tuberosity of the humerus. The deltoid muscle is responsible for abducting the arm (moving it away from the midline of the body), as well as flexing and medially rotating it, and extending and laterally rotating it.