The deltoid muscle (or musculus deltoideus) is the muscle [1] forming the rounded contour of the human shoulder. It is also known as the 'common shoulder muscle', particularly in other animals such as the …

Apr 23, 2024 · The deltoid is a large, thick triangular skeletal muscle in the shoulder joint, connecting the arm to the body trunk. Its name derives from ‘delta’ (Δ), the Greek letter that it resembles in shape.

Oct 30, 2023 · The deltoid is a large shoulder muscle and its principal abductor. Learn about its anatomy, innervation, function and more at Kenhub!

Sep 24, 2021 · Your deltoid muscles are in your shoulder, which is the ball-and-socket joint that connects your arm to the trunk of your body. Deltoid muscles help you move your arms in different …

The Deltoid muscle is a large triangular-shaped muscle that lies over the glenohumeral joint and which gives the shoulder its rounded contour. It is comprised of three distinct portions (anterior or …

Sep 23, 2025 · The deltoid muscle is one of the main abductors of the shoulder, meaning it helps lift the arm when reaching for objects or brushing the hair. It’s also activated when carrying heavy weights, …

Sep 2, 2025 · The deltoid is a large muscle responsible for lifting the arm and giving the shoulder its range of motion. Pain in this area may be due to issues like overuse or injury.

Dec 9, 2025 · The deltoid originates on the lateral aspect of the acromion and clavicle and then inserts on the lateral aspect of the humerus. Its major action is to abduct the arm (lift the arm out to the side …

Discover the 12 best deltoid exercises to build stronger, broader shoulders. Learn proper form, benefits, and safe training tips for all levels.

Jan 31, 2026 · The deltoid muscle is the main muscle of the shoulder. It helps to lift the arm up and rotate the shoulder.